Verizon Wireless’ tests of its fourth-generation (4G) wireless network technology in Seattle and Boston may mark the start of a major transformation in mobile broadband access.

How to save on cellphone costs when traveling in Europe.

For the past month I have been receiving a pop-up that says: “Other people are logged onto this computer. Shutting down Windows might cause them to lose data. Do you still want to continue shutting down?” I have McAfee security and I’m running Windows XP. Do I have anything to be concerned about?

s a general rule, if you’re being offered the chance to opt out of something you never opted in for, don’t. If the proffered opt-out is via e-mail, it’s probably from a spammer and your “opt out” message simply confirms to the spammer that your address is a good one. If that’s the case, you’ll end up with more, not less, unsolicited mail.

Playing the DVD is one thing. Copying it to a file you can edit on your computer is another.

Everything from touchpads to voice control will soon come to your humble remote control, as several companies are upgrading their technology with new designs and more options.

The Mac has always had an edge when it comes to networking, making it easy to find other computers on your network and connect to them. But this time around, I can say the process is actually effortless, thanks to the online storage service Dropbox and a clever utility called Growl.

If the firewall is not correctly configured, you won’t be able to access things beyond the firewall, whether it’s another computer or the Internet. If your repair person can’t correctly configure the software, you’re going to have to find someone who can.

Antivirus software cuts two ways. It’s great at blocking known viruses, but it can sometimes misfire, mistakenly flagging clean files as malicious. That sends a computer into a tailspin trying to clean up stuff that’s supposed to be on there.

Twitter postponed a network upgrade scheduled for Monday night to avoid cutting service to Iranians. They’ve been using the social-networking site to communicate during violent protests sweeping Tehran in the aftermath of the presidential election.