Something like, there's a main function... and 3 sub functions...

Main
SmallFunc
MedFunc
LargeFunc


And then, Main calls each one, but each one only goes a certain ways through..
SmallFunc, a few commands
MedFunc, a few commands more than SmallFunc
LargeFunc, a few commands more than MedFunc

So that, all of the functions complete at about the same time? Is that what you mean?