ScrolledWindow 

The ScrolledWindow provides a movable view into a window that has more contents 
than can be displayed at one time due to the size of that window. A ScrollBar
manipulates the ScrolledWindow's contents. The ScrolledWindow can also be 
resized to see more or less of the contents, as you desire. The ScrollBars 
adjust to accommodate the new size. The ScrollBars may disappear when the window
is sized so that all of the data is visible (when the scrollBarDisplayPolicy 
resource is XmAS_NEEDED). However, most ScrolledWindows in Sun MTPScan keep their 
ScrollBar(s) visible at all times (the scrollBarDisplayPolicy resource is 
XmSTATIC).

See also: ScrollBar
