Futurebasic/Language/Reference/window output

Syntax
WINDOW OUTPUT [#]idExpr

Description
This statement makes an existing window the current output window. The current output window is the destination for any subsequent text and drawing commands, and is the target window for such statements and functions as,  , etc.

The  can be either a positive or negative number;   affects the window whose ID number is. If you specify a negative, the window becomes invisible. If you specify a positive, the window becomes visible.

Note
does not activate the specified window (i.e., it does not highlight its contents nor bring it to the front), if there are other visible windows open. Use the  statement when you want to explicitly activate a window. (Note: the statement also makes the specified window the current output window.)

is useful in cases where you need to update the contents of a window which may be in the background, without bringing the window to the front.