NPC Schedules

Could someone please explain to me how to make these schedules work:
http://developer.valvesoftware.com/w...ared_schedules

It’s sort of explained here, but I don’t understand:

I really want to get SCHED_IDLE_WANDER to work on a group of NPCs so they’re in different positions for a series of pictures (assuming it does what I think it does).

Thank you.