Hi,
Hi there are several technique for inter process communication depending also on the OS you are running on.
For Unix :
Signals
Pipes
Message Queues
Sockets
Semaphores
Shared Memory
For detailed information :
IPC Linux[
^]
For Windows there :
Clipboard
COM
Data Copy
DDE
File Mapping
Mailslots
Pipes
RPC
Windows Sockets
For detailed information :
IPC Win[
^]