two questions:

1) how do I make a trigger fire when a specific unit is inside the boundary?
2)how do I make a trigger fire when multiple other triggers have been fired?

thanks!
Trout

1. Simply right click the trigger and choose "Set Trigger Owner" from the top menu. Drag the line to the unit you need to activate it, then check the triggers settings. You will notice those options have changed and now fit what you want to do.
2. Kinda depends on what you are trying to accomplish.

For stuff like this (as in, basic editor questions with no specific relevance to ALiVE), it's probably best to post in the BI forums.

2.) triggerActivated trigger && triggerActivated trigger2