can i upgrade two computers
I have two computer below. I upgraded my MP to 10.6.8. can I use the same discs to upgrade the MacBook?
Mac Pro, Mac OS X (10.6.8)
Legally, not with Snow Leopard (10.6), unless you purchased a "Family Pack".
However, Lion and Mountain Lion allow you to upgrade all the Macs you own/control, assuming you are not a commercial user (that is to say, you may install Lion or Mountain Lion on all your personal/family Macs).