We installed and opened TeamViewer on two Windows 7 PCs; one a 64-bit desktop, the other a 32-bit netbook. TeamViewer provides a user name and password for each machine. You simply need to enter each machine's numbers in the other to create a connection. The host PC's screen displays the remote PC's desktop in a window, and the host machine's mouse and keyboard control the remote PC's counterparts. We could open folders, files, and programs; run processes; and change settings: anything we could do with the remote machine's own controls, we could do from our main PC's controls, too, with TeamViewer. We tried the Meeting tool, too, but since we had TeamViewer installed on just two PCs, our pool of invitees was a bit small. TeamViewer offers some useful options; for instance, you can limit it to file transfers if you don't need total control.
TeamViewer is simply the easiest tool of its type we've used, and a far cry from the VPN apps of not so long ago. And it can cut down on the phone tag when friends and family need tech support!