Hello,
Those 3 license family packs were hard to locate! Congrats!
You can install and Activate (within 30 days of installation) your copy 3 times. When you activate, MS computers keep track of how many times you've used it. There isn't a screen that tells you how many times you have activated it, but most people know.
If you have trouble you can always start the online phone support by , typing slui.exe 4, on the Start Menu, clicking yes on the UAC screen, click on the drop down menu and select the nearest location to you for a toll free number to call.