Help: pipe accross two processes

[Munisuvratha Chetan]

Hi,
I have a problem with "pipe"s, which might have appeared earlier.

I have two processes - a server and a client.
The server runs in an infinite loop untill killed.
After the server is brought up, clients wil be forked, from a
different shell.  If the clients know the process id of the
server, how can I establish a communication channel between the
two using pipes (and signals, if necessary) only.
I know how to create pipes between a parent and child.

Any help is greatly appreciated.
Thanx a bunch.