sending/notifying a server process

Hi All, I have a server process that sends fax,print, etc (both in C# and in Java). Currently it polls says the fax table in the database for any fax jobs. How can I get my PHP script to call or notify these services directly so not having to wait for the next poll. I can't open a socket to the server vai the PHP so what mechanism do I use? Any hints will be grateful -- Tony Yau