Windows remote desktop, so useful, especially in an office environment, where you just have to do some things with a mouse, but it's not enabled by default (probably a good thing for security reasons).
But what if you want to get into a remote windows machine, and it's over an hour away, talk the person through control panel?, or just go in yourself (especially when you have about a dozen computers to do this with)?.
The following changes a value in the registry which will then enable remote desktop, you could use regedit, and it's connect to network registry feature (though with windows 7 you have to enable the remote registry service for that to work), but I prefer the following:
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server" /v fDenyTSConnections /t reg_dword /d 0 /f
some say that you have to reboot the machine after you do this, I personally didn't (maybe I was lucky?)
you can run the above command via psexec (the -h is required for windows vista/7 machines),
ie: psexec -h \\remote-pc -u domain\administrator reg add "HKLM ....
thanks to orielly and the backroomtech.com for the registry edit, if you want the gui version check these sites: