How to set focus on an extern process

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C#

1. I wrote a program to use with two keyboards.

For example: If I have two open documents in Word, the message from keyboard 1 goes to document 1 and keyboard 2 to document 2. When I receive a message in document 1, I lose focus in the second document. I want to know how I can set the focus back to the same point that I lost it.

2. Does anyone know If I can do a mouse click at a different place than the current cursor location (for using two mice at the same time)?

Thanks all.