This application selects the first, i.e.
oldest, empty FRAME picture in
the graphics database
for a graphics device. Empty means that there is no additional
picture lying completely with its bounds. This implies that the FRAME is clear for
plotting. This task is probably most useful for plotting data in a grid of FRAME
DEVICE = DEVICE (Read)
[The current graphics device
selects the first empty FRAME picture for the current graphics device.
xwindows This selects the first empty FRAME picture for the xwindows graphics device.
The execution time is approximately proportional
to the number of pictures in the database before the first empty FRAME picture is