single login across multiple computers

How do I set the single computer use time for the user logging into mutiple computers?

 

For eg: USer A has account on comp1 and comp2

 

If I set the computer usage time for this user  per day to 2 hrs the current norton online give 2+2=4 hrs for this user. that is the user can always timeout on comp1 and then login into comp 2 for next 2 hrs.

 

I would like to have single 2 hrs limit comp1 and cpm2 combined .  Is this feature supported?