Procedure Window(X1,Y1,X2,Y2:Word)

    Updates VX and VY       : Yes
    Updates Cursor Position : Yes

    This sets an area of the  screen  to  write  to.  This is usually the
    entire virtual screen.

    Example

    Window(82,15,150,40)

    will cause

    GotoXY(1,1)

    to move the current write position to (82,15).