Ref Sec31.8.17.
SET MODE SEGMENTS
SET MODE SEGMENTS causes Ferret to utilize GKS
segments
("GKS" is the Graphical Kernel System—an international graphics
standard). On some systems MODE SEGMENTS may be necessary to update
windows following "occlusion" events or to resize window with the mouse.
Segments, however, make heavy demands on the system's
virtual memory. If Ferret crashes during graphics output due to
insufficient virtual memory try CANCEL MODE SEGMENTS.
default state: set