http://en.wikipedia.org/wiki/NTFS_junction_pointThe short line: mount point or shortcut. A junction point allows you to point C:\Documents and Settings\User\My Documents\EA Games\ to anywhere you like: you can point it to D:\Games\Sims if you like.
I use it on my own system to point all temp folders (C:\Windows\Temp, C:\Documents and Settings\User\Local Settings\Temp, C:\Documents and Settings\All Users\Local Settings\Temp, C:\Documents and Settings\LocalService\Local Settings\Temp, C:\Documents and Settings\NetworkService\Local Settings\Temp) to a flash drive (F:\Temp), and some other tricks like that.
This GUI tool will allow you to easily create them:
Junction Link MagicNot recommended if you don't have the slightest clue what you're doing: you can seriously mess up your system with this.