Save whole screen image and coordinate to an internal buffer
SAVE SCREEN save the image of the whole screen into an internal buffer, it also save current cursor position. The information could later be restored by REST SCREEN. Each call to SAVE SCREEN overwrite the internal buffer.
SAVE SCREEN command is preprocessed into __XSaveScreen() function during compile time. Note that SAVE SCREEN TO is preprocessed into SaveScreen() function.
// save the screen, display list of files than restore the screen SAVE SCREEN DIR *.* WAIT RESTORE SCREEN
RESTORE SCREEN, __XRestScreen(), __XSaveScreen()