You can sign PDF documents in Windows, completely electronically, using the PDF viewing program Adobe Reader. Here's how.

What do you do if you receive a PDF document by e-mail and need to sign it and send it back? You probably print it out, sign it, and then scan it again before e-mailing it. It’s a tedious process and ...

There are some tasks that will never be suitable for a smartphone—serious video editing and serious spreadsheeting, for example—but there’s plenty that you can do on these pocket devices, and that ...