One License and multiple PCs, how does it work?
I know for previous versions of Windows, you were allowed to install the same key onto 3 different computers. Is this the same with Windows 7?
Windows OEM - One machine and dies with that machine. Windows Upgrade - Upgrades a single copy of Windows to the latest version. Windows Fully packaged Product - Only one machine, but can be moved to another machine (can only be installed at one place at any one time). Windows 7 Family Pack - 3 licences for different computers at any one time.
Windows Activation is designed to stop pirates from installing on hundreds of computers, if you just install it on a couple of machines, it will work - and if you hit the limit, then ring them up, they usually authorise it HOWEVER it doesn't mean it is legal to break the limits just because it works.
There has never been a general "3 computers per license" rule for Windows. Consumer licenses are one computer to one license (at a time). If the license is non-OEM, it's transferable to a new system if it's removed from the old system.
So, to answer your question, Windows 7 operates in the same fashion: one system per consumer license.