hi,
 
> would also like to send keystrokes to the other window
>(page up and down in a Acrobat window)
 
in general you can use API PostmessageA() to do this, but it is "more" work
i "think" you have to send it to the "Body" of Acrobat Reader, so you have to
"scan Childs" for there "Handle".
 
see Picture :
a.) on Titlebar
 
b.) on "Body"
 
greetings by OHR
Jimmy