pane-viewport [Generic Function]
Summary: Returns the pane's viewport, if one exists.
pane-viewport-region [Generic Function]
Summary: If a viewport for the pane exists, the viewport's region is returned.
pane-scroller [Generic Function]
Summary: Checks to see whether a pane has an associated scroller pane, and returns it if it does.
scroll-extent [Generic Function]
Summary: If the pane argument has an associated viewport, it resets the viewport to display the portion of the underlying stream starting at ( x , y ).
Common Lisp Interface Manager 2.0 User's Guide - 7 Aug 2017