If both of these machines qualify for the Home Edition (home, non-commercial use), AND they are physically located in the same household, then YES, you can use the same serial number on both of them.
I am a newly registered user to “Avast 4.x Home/Pro” & have a questions which I feel maybe answered through this thread.
In our household we run three networked computers (2 XP(SP2) & 1 Win98se) all three PC’s satisfy the non-use for financial gain or business criteria to allow free use.
How do I best implement the use of Avast with this setup?
Load Avast on all three machines (Using one common key) or
Run Avast on PC with INTERNET connection share implemented in some sort of network capacity.