help.
once someone leaves a game of starcraft all the units that player had goes to player 12. In order to make triggers to recieve their units you will either need an editor like SC X-tra (SCXE) or download some file that allows you to make player 12 triggers. Then all you need to do is make the trigger for it.
Im not fully sure of what this trigger will be, ive never done this but i think it will be...
Player:
Player 12
Condition:
player 12 brings atleast 1 men to 'anywhere'
Actions:
Give all men to force 1 (or whatever the force is that you want to give it to.)
Preserve trigger.