Which Microsoft License Key allows you to use it multiple times on different machines.

Which Microsoft License Key allows you to use it multiple times on different machines.

• VLSC
• ABS
• VLC
• MAK 

EXPLANATION

MAK (Multiple Activation Key) allows you to use the same key on multiple installations of Windows at a time.
VLC (Video Lan Client) is a powerful media player.
ABS (Antilock brake system or Absolute value, depending on which of the two kinds of people you are) is just a throw away answer.
VLSC (Volume Licensing Center) is Microsoft's site that people use to manage and retrieve their licenses and Software.

SOURCE

https://technet.microsoft.com/en-us/library/ff793435.aspx