A guarantee that, at least when multiplayer starts, the 'terminal ID' numbers (MPRECV 'SID', MPSTAT, MPNAME$, MPGET), are 0 and 1 (when 2 consoles are in the initial connection), 0 1 and 2 (for 3 consoles), or 0 1 2 and 3 (for 4 consoles).