The GRAPH('UPDATE',
. . . ) function closes the graph currently open and displays it.
DSGI operates in buffered mode, so the picture is never displayed
until this function is called.
This function can be
called only once for the currently open graph. Therefore, you cannot
incrementally build a graph. However, you can close the currently
open graph and later insert it into another graph within the same
DATA step.
This function moves
the operating state from SGOP to WSAC.