how do you send messages from one APP to another?

[Maulkin]

I need help sending messages e.g. a string from one application to another application.

 

[tdatgod]

Hi,
why not use the SHELL?

have prog1 write the string to STDOUT and have the second program read from STDIN then use a PIPE?

prog1 | prog2

To code this internally you could make the PIPE yourself.

 

[migur]

it is called interprocess communication. You did not indicate whether these apps are on the same machine or not. There are pipes, messages, sockets, shared memory: many different IPC facilities. It is very much OS dependent.
On Unix I would use messages or tcp sockets.