




The function output-pane-cached-display-user-info gets and sets the 
user-info
 in the current cached display of the output pane 
pane
.
If 
pane
 does not have a cached display, the getter returns nil and the setter has no effect (but returns the new 
user-info
 as per normal Common Lisp conventions).
A value that is set by the setter will be returned by the getter until the cached display is freed by a call to output-pane-free-cached-display, either explicitly or implicitly. Note that this means that calls to start-drawing-with-cached-display and output-pane-cache-display also reset the user-info .
output-pane-free-cached-display
start-drawing-with-cached-display
Transient display on output-pane and subclasses
CAPI User Guide and Reference Manual (Windows version) - 3 Aug 2017