Telling any program to perform some action

Question

In linux (Ubuntu 10.04) is there a command line way to tell a program to preform an action? Let's say, for example, tell pid 12345 to execute "Ctrl+S" without stealing focus from my current window?

I don't think what I'm looking for is a "macro" because I want it to be executed in the background.

Thanks!

Answer 1

Here is a previous answer that may help: Adobe's answer to 'What do you use for linux keyboard macros?'