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Each display window may or may not have an associated alpha memory
depending on the options in the CREATE/DISPLAY command.
The alpha memory is attached to the bottom of the display window and
consists of 3 lines, the number of
characters per line depends on the width of the image display.
Commands associated with the alpha memory are:
LABEL/DISPLAY - write a string into the alpha memory
CLEAR/ALPHA - clear the alpha memory
Petra Nass
1999-06-09