Sending Information Between Two VB Programs

I'm wanting to transfer data between two programs. Basically, I have one program which is the "monitor" program. It opens another program and will fill a textbox in said program and then click a button on the program. When everything is done after clicking the button, the program will need to send something back to the monitor to tell it to close the program and open up another one to start the process over again.

How would I go about doing this?

Are you creating both programs? Is the client program supposed to know that the server exists, or should it be unaware that it's being controlled by a program rather than a user?

I am creating both programs, therefore I will know all of the control names, etc. etc.

You've only answered one of my questions.

you can use socket programming for this. May be this example will be helpful to you.