Waiting for a Spawn'ed process

[Sharad Gupta]

I am trying to make a Utility which spwans=>pipeShell off 
multiple processes on user choice.

On of the issues is that some process need to wait for other 
processes to finish. Now I could implement it using messages but 
that doesn't seem very nice solution. I could also wait for the 
pipeShell pid but was wondering what is the standard or 
recommended way to wait on a spawned process?