Syntax:
USEASBMP
Uses the current back buffer (hidden surface) for the background image as LOADBMP would do.
Sample:
// Star backgroundFOR i=0 TO 1000 PRINT *, RND(800), RND(600)NEXTUSEASBMP // Save as backgroundFOR i=0 TO 600 PRINT -=v=-, 100, i SHOWSCREENNEXTMOUSEWAIT