[mod_python] communication between main_interpreter and subinterpreters

Hi Folks,
I'm working on a server push framework that keeps subinterpreters open 
and serving for indefinitly long periods of time.  The main program 
control is a command-line script, which keeps track of the 
subinterpreters and communicates with them via UDP sockets.  That works 
in my tests,  but that UDP layer is a *lot* of overhead. 

Is there another way that a command-line script or main_interpreter can 
track and reference instances of subinterpreters?

thanks,
andy c