using win32::api to "talk" to another program - need a little help!

From: Paul S. (pauls_at_nospam.com)
Date: 01/28/05 

Date: Thu, 27 Jan 2005 20:00:18 -0800

Hi,
I want to use the Win32::API module to communicate with another program
running on my windows machine. I have the file handle # for the pther
program and have some sense that I need to use the PostMessage function
but I am little confused about the exact way to do it. Let's say the
message I want to transmit to the other process is:

plot v(out) return

(this is a valid command to type into the other programs GUI) the
"return" means I actually hit the return key after I had typed "plot
v(out)" into the GUI of the other software

How would I then do it?

Any help greatly appreciated?

Thanks!

Paul