Syntax:

USEASBMP

Uses the current back buffer (hidden surface) for the background image as LOADBMP would do.

Sample:

// Star background
FOR i=0 TO 1000
    PRINT “*”, RND(800), RND(600)
NEXT
USEASBMP // Save as background

FOR i=0 TO 600
    PRINT “-=v=-”, 100, i
    SHOWSCREEN
NEXT
MOUSEWAIT