Its a feature that does not work on every Window version,
thats why you can probably not recreate it.

Some posts describe it as using contol+alt+cursorkey

Its as simple as that.

Some small recent games of mine:
Griefer 4k http://damocles11.byethost9.com/griefer4k.html
Kobold 4k http://damocles11.byethost9.com/kobold.html
Cave 4k http://damocles11.byethost9.com/cave4k.html