Hold Screen and Line Output Speed

Dear All

I am playing with GNU prolog:
	GNU Prolog 1.3.1
	By Daniel Diaz
	Copyright (C) 1999-2009 Daniel Diaz
	on windows vista

I am running the following query:

?- repeat, write('Hello World!'), nl, fail.

The query will infinitely output the line
"Hello World!". This is fine.

Observation:
     Ctrl-C does not work, menu item Interrupt
     does also not work. The interrupt text is
     shown, but then it scrolls away?
     This is strange.

Question 1:
     Is there some Hold Screen button?
     (A toggle where we can switch on/off the
     blocking of the output producer)

Question 2:
     Is the speed of the terminal scrolling
     just an artefact from the GUI speed, or
     is there some setting for this?

Bye