I have 4 computer can I use NIS on 4 computers

[hussam_o_r]

I have 4 computers at home

lets call them by numbers

1 and 2 are mine

3 and 4 are for my family

 

1 and 2 are never use at the same time

 

so is it possible to use the license on on 1 and 2 if they aren't switched on at same time?