Notifier’s home screen condenses quick snapshots of data from various sources into: “New,” “My Update” and “My Stream.”

For the past week, I’ve been testing an application called Notifier by iSkoot Inc. (iSkoot.com), which is designed to give basic cellphones a smart-phone-like shot in the arm. Notifier aggregates updates from various sources and social communities — including email, Facebook, Twitter, news feeds and instant messaging — into one application made for no-frills phones.

I tried Notifier on a Samsung Propel that costs $50 with a two-year contract and rebate. I appreciated the app’s way of keeping so much content in one spot, which saved me from checking various places for information. And Notifier is designed so you should need to sign into an account only once. But I found serious drawbacks in the experience.

Unlike on a BlackBerry or an iPhone, on which you can place programs you use frequently on the very first screen, Notifier is buried on the phone in a section called “My Stuff,” under a section called “Games and Apps,” which takes 10 clicks to reach. That’s a tremendous pain when you just want to quickly check Facebook. There aren’t any shortcuts or hard keys on phones that will open Notifier more quickly.

Second, Notifier’s user interface can be awkward. Posting updates to my social networks through Notifier was a clumsy process that was riddled with extra steps. My phone even had a slide-out QWERTY keyboard, but I preferred to use Notifier for its namesake purpose: It “notified” me of news like friends’ status updates, new messages (tweets) on Twitter and RSS news feeds.

Notifier costs $3 monthly and is exclusively available on roughly 30 AT&T (T) phones, 21 of which don’t have QWERTY keyboards. AT&T advises people who use it to do so with a data plan; these start at $15 monthly for unlimited data without text messaging. You must buy Notifier in AT&T’s online store, MEdia Mall.

Smart phones are flush with apps that aggregate content from several social networks into one spot, including Xumii for the BlackBerry or iPhone and a feature called Pulse in Yahoo’s (YHOO) oneConnect for the iPhone. There’s even a fun — though not too functional — iPhone app called Ziibii that floats social-network tidbits down an on-screen river.

Whether they’re on smart phones or basic cellphones, apps that display a lot of data in one condensed place need to do so clearly. Notifier does this by displaying a ribbon of icons at the top of the phone’s screen that it calls the carousel, and you can move the phone’s directional arrows left or right to switch from one program to the next. Whatever icon is highlighted in the carousel is the program that appears on the rest of the screen.

A tiny house icon represents the home screen, where three categories of boxes show quick snapshots of data: “New,” “My Update” and “My Stream.” The top box, labeled New, shows names of programs with numbers to show how many new items, or updates, were submitted to that program. For example, “Inbox: 3″ means that three new emails were received; “Feeds: 54″ represents 54 newly received snippets of news from an easy-to-use RSS reader built into Notifier.

Below this data are the My Update and My Stream sections, with left and right arrows to let you scan through various subcategories within each section. My Update shows your status on the various social networking sites.

I found My Stream to be a little confusing. It lets you arrow left or right to see what’s going on in your social network — if you received a new email, for instance, or someone sent you an instant message. But because you’re arrowing left or right, not up and down in a list, it’s hard to find the beginning of this stream. And Facebook notifications are a little too vague; one might say, “Barbie Roberts updated her Facebook profile,” without telling you what she did to update it.

Another Facebook glitch that I ran into was that I had to sign in more than once. This could be a hassle if you’re on the road and nowhere near a computer. In one instance, I was signed in and typed out a status update, but had to sign into Facebook yet again to post my new status. ISkoot says this and other Facebook navigation issues will be fixed within a week.

I flicked through My Stream while standing in line to board a plane and minimized the Notifier screen to get back to the phone’s functionality. Notifier can alert you of new messages even when it’s minimized. This works because the app stays connected to the network, so when you get a new message on Facebook, an email or an instant message, an indicator pops up asking if you’d like to open up the Notifier screen.

The trouble with this indicator is that it doesn’t specify what kind of message you received. I care a lot more about email and instant messages than I do about Facebook messages and would rather not be notified about Facebook. And messages received in the Facebook inbox won’t display in Notifier’s “New” inbox; instead users must take an extra step out to the browser. The company says it’s working on fixing this.

I liked the Notifier news feeds, which were easy to set up. A technology category offered content from 11 sources, and the entertainment category’s seven sources ranged from Rolling Stone to the Onion to Perez Hilton. These feeds are mixed into My Stream, like email or any other news from your network.

Instant messaging, however, required too many steps. It took a while for buddy lists to load. When I selected a person’s name to start an IM conversation, a white screen appeared that looked like a place where I could type my message, but I had to select a “Write” option to skip to another screen and start composing. Likewise, emails couldn’t be typed on the screen of the message itself; rather, you have to open a separate screen for text entry. You might get used to this after a while, but it felt clumsy to me.

Notifier’s extra $18 monthly cost (not including a voice plan) might be worthwhile if you just need a way to stay plugged in and notified of the latest goings-on with friends and email. And compared with the cost of a smart phone, it might be an economical alternative. But its awkward interface and poor placement on the cellphone leave a lot of room for improvement.

Edited By Walter S. Mossberg

• Email us at mossbergsolution@wsj.com. Find this and other columns and videos online free at the All Things Digital Web site: http://solution.allthingsd.com

About 18 months ago, the giant PC maker brought out an unusual desktop computer called the TouchSmart, a bulky model meant for kitchen counters. It was intended as a walk-up home kiosk, with large icons you could activate by merely touching them to check the weather or to consult your calendar.

This TouchSmart was praised for its originality, but it wasn’t as practical as promised, and wasn’t a big hit. Still, H-P is persevering with the concept. It has refined the hardware and the touch-controlled software, and has come up with a new line set to go on sale by mid-July.

This new TouchSmart, which comes in two models priced at $1,299 and $1,499, is a relatively slim, one-piece desktop with a large 22-inch screen. It resembles the Apple iMac or the Dell XPS One and, like the latter, runs Microsoft’s Windows Vista. It has a wireless keyboard and mouse, and can be used as a normal Vista computer.

But, like the first TouchSmart, this new model comes with H-P’s touch-controlled user interface and special programs designed to be manipulated with your fingers. For this model, H-P is de-emphasizing the idea that the machine is meant for the kitchen, but it is forging ahead strongly with the notion that touch control is the wave of the future.

After testing the new TouchSmart PC for a few days, my verdict is mixed. The TouchSmart software is indeed improved. It’s attractive, more versatile and more practical — and fun to use. The hardware is handsome and well-equipped. And H-P deserves credit for continuing to build software expertise in a world where makers of computers and cellphones must become as expert at software as they are at hardware. But the latest effort has some problems.

The TouchSmart interface is inviting. There’s a top row with huge icons, called tiles, displaying your favorite programs, and a bottom row of smaller tiles for other programs. You can scroll each row with a finger and decide which programs go in which row. You can even include in either row not only TouchSmart programs, but the regular Windows programs or Web sites that you like. When you tap on a tile that isn’t for a special TouchSmart program, the computer pops you into the regular Windows interface. To return to the TouchSmart interface, you just tap a home button below the screen.

Hewlett-Packard’s TouchSmart

The TouchSmart software includes a calendar, a weather widget, a clock, music and video players, a program for composing short notes, and even a basic Web browser. All worked OK in my tests, but they’re simple and limited.

The computer itself is fairly powerful. Both models have dual-core processors, large hard disks, and a whopping 4 gigabytes of memory. And both run the special 64-bit version of Vista, which allows more memory usage and can be much faster than regular Vista, but only if you buy special 64-bit software programs. This machine is loaded with every conceivable port and connector, mostly hidden from view, and the high-end model even has a TV tuner.

But this is still a Vista computer, with all of the disadvantages that entails, especially a sluggish start-up and an annoying barrage of pop-up warnings. And the new TouchSmart is preloaded with craplets, those irritating trial programs and come-ons that you didn’t order.

There’s a built-in Webcam that works in low light, but it’s almost impossible to tilt the computer forward to get the best shot. Plus, the TouchSmart software interface is very basic and is ragged around the edges. It isn’t a multitouch interface — like the ones on the Apple iPhone and in the next version of Windows, code-named Windows 7, that recognize a variety of gestures and perform different tasks when multiple fingers are used rather than just one. For example, you can’t rotate a photo on the TouchSmart by grabbing it with your fingers, or move back and forth through Web pages by swiping the browser with your fingers.

The TouchSmart software is just a thin shell plopped on top of Vista, and it crashed on me four times during the course of a few days of testing. Also, the limitations of the TouchSmart applications can be frustrating. The photo application wouldn’t let me create albums. The music application didn’t display artist names for some of my MP3 files, and the calendar application can’t display an onscreen reminder of an event if you’re working in the main Vista interface.

If you’re intrigued by the idea of a quick and simple interface on a handsome one-piece Vista machine, the TouchSmart might make sense. But it doesn’t deliver on the full promise of touch computing.

• Find all of Walt Mossberg’s columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com. Email him at mossberg@wsj.com.

My Dell PC, which is an older model running Windows XP, is very slow to boot up and I have a lot of icons on my desktop. Does the number of icons on my desktop have any relationship to the time it takes my PC to boot up?

Everything a PC must do when it starts up takes some time, and that includes drawing the desktop. A desktop with fewer icons takes less time to re-create. But, if your machine is “very slow” to start up, you may also have accumulated too many programs that are set to run upon start-up, including programs that you can’t see because they are launching behind the scenes. So, it would be wise to examine these programs and remove or disable as many as you can, keeping only those you really need. I suggest you obtain and run a program designed to help you do this. One good one comes from PC Magazine and is called Startup Cop Pro 3. It costs $8 and can be found at pcmag.com/downloads.

If I buy a Mac, can I move all the programs on my Dell over to the Mac?

While most common Windows file types can be copied to a Mac and will work there, the Windows programs on your Dell won’t run on the Mac’s operating system, so there’s no point in moving them to a Mac. There is one exception: If you plan to install and use Windows on your Mac, then your programs should run. However, some programs are designed to be locked to a single PC and won’t run on a second machine, even if it is a new Dell instead of a Mac running Windows. Furthermore, it can be difficult to move Windows programs to a new machine, because they are often made up of parts that are scattered in various places on the hard disk.

Two of the companies whose software allows you to run Windows on a Mac, Parallels and VMWare, do offer utilities that will copy the contents of a Windows PC to the portion of the Mac devoted to running Windows. The Parallels utility is called Transporter and the VMWare utility is called Converter.

Like many Internet users I have used Wi-Fi in airports, hotels and coffee bars. I have used it to access banking and brokerage accounts. Just how much at risk have I been? I am a Mac user. Am I more or less at risk than a Windows user?

No matter what kind of computer you use, there is some chance, however small, that a crook can intercept any data you send or receive over a public wireless network. So, my advice is to never, ever conduct financial transactions, or any highly sensitive communications, over any network you don’t control. It’s the same principle people should use when making voice calls on cellphones, which are easier to intercept than voice calls made on land lines. Be cognizant of the content of your communications of any kind when you are using public wireless networks.

You can find Mossberg’s Mailbox, and my other columns, online free at the new All Things Digital web site, http://walt.allthingsd.com.

Here are a few questions about computers I’ve received recently from people like you, and my answers. I have edited and restated the questions a bit, for readability. This week my mailbox contained questions about recovering deleted icons, clearing search histories and the difference between laptop processors.

If you have a question, send it to me at mossberg@wsj.com, and I may select it to be answered here in Mossberg’s Mailbox.

I accidentally deleted from my Windows XP desktop the icon for a program I use often. I know that this doesn’t mean I have deleted the program. But how do I get its icon back on the desktop?

There are multiple ways to do it, but here are a couple. You can click on the Start Button, then on All Programs, then locate the entry for the program, and just drag that entry onto your desktop. Or, you can locate the program file itself (it’s typically in a subfolder of the Program Files folder), select the file, click the right mouse button and then click on “Send To.” From the next menu that appears, select “Desktop (create shortcut).”

In the Firefox Web browser, how do I erase all traces of my browsing activity, so another user of the same computer can’t see what I’ve been doing online?

Go to the Tools menu, and select “Clear Private Data…”. This will bring up a list of traces that can be expunged. You just check off the ones you want obliterated, and then click on the button at the bottom labeled “Clear Private Data Now.”

To be absolutely safe, you can check off the entire list, but, generally speaking, clearing the browser history, download history, cookies and cache should hide your tracks from a casual user.

Be aware that there’s a downside to this. After clearing out this stuff, your Web surfing could slow down a little, because you won’t have any cached pages for the browser to use to speed up the loading of sites you’ve visited in the past. Also, by purging all cookies, you will lose the automatic log-ins and saved preferences, from some sites.

I am shopping for a laptop, and am confused by some of the processor choices. Specifically, what is the difference between Intel’s new Core Duo chip and the Core Solo chip?

Both are new designs, which combine power with greater efficiency. They run cooler than older processors, thus allowing for thinner laptops, fewer fans, and, in some cases, better battery life. But the Core Solo is, like most past processors, a single digital brain. The Core Duo packs two brains — two “cores,” each the equivalent of a single processor — onto one chip. This potentially offers greater speed in performing tasks on the computer, especially when you are running several programs at once, and especially if one or more of the programs is demanding.

Bear in mind, however, that to get the most out of the dual-core design, your software should know how to use the twin cores. Not all software does, though this should improve over time, as software is revised to better use the new chips. Also, the overall performance of a computer depends on many factors beyond the processor. These include how much memory you have, the power of the video subsystem and the speed of your Internet connection.

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Because of the volume of e-mail I receive, I can’t routinely answer individual questions by e-mail, or consult on individual problems or purchasing decisions. I read all questions I receive and select three each week to answer in the column.

Write to Walter S. Mossberg at mossberg@wsj.com