zombie script tutorial

[BronzeEagle]

if you're looking at this you probably expect one.  So do I.  I want to know how to make respawning zombies come out of nowhere.  How do i do this?   At least if you can't tell me, plz write a tutorial.  

[ponq]

do you want to spawn enemies "out of the blue" on random locations?
Plz be a bit more specific.