[TxMt] Cursor following PageUp/PageDn

[Mai Thomas]

Hi!

Can I make the cursor follow when I've done some scrolling via Page-Up/ 
Page-Down?

I mean... let's say: I've scrolled down 3 pages via Page-Down and now  
I want to go on editing right on this page.
To do so, I must click with the mouse somewhere on the document. But  
is this possible by using the keyboard too? E.g., is there a Shortcut  
that positions the cursor right in the middle of displayed page?

Thanks for hints...
Tom