what if i want to install sins on another computer of mine? is that allowed
Allowed as in it will work?
Yes, it will work....you can have an unlimited number of copies of your game installed...impulse will not prevent you from installing the game on any computer even if you use the same account over and over...you can have multiple instances of the same account play with each other even in multiplayer...
Allowed as in is it legal?
Monk may be right about the two copies, I'm not entirely certain...it was my understanding that the license allowed one copy of Sins can be installed to infinite computers (you may or may not be required to own them, I don't know)...the license allows this under the condition that only ONE of those copies is being used at any time...