A mirror is the Lisp object that is the handle to the actual toolkit window or gadget.
sheet-direct-mirror [Generic Function]
Summary: Returns the mirror of the sheet sheet . If the sheet is not mirrored (or does not currently have a mirror), sheet-mirror returns nil .
sheet-mirrored-ancestor [Generic Function]
Summary: Returns the nearest mirrored ancestor of the sheet sheet .
sheet-mirror [Generic Function]
Summary: Returns the mirror of the sheet sheet . If the sheet is not itself mirrored, sheet-mirror returns the direct mirror of its nearest mirrored ancestor. sheet-mirror could be implemented as:
(defun sheet-mirror (sheet)
(sheet-direct-mirror (sheet-mirrored-ancestor sheet)))
realize-mirror [Generic Function]
Arguments: port mirrored-sheet
Summary: Creates a mirror for the sheet mirrored-sheet on the port port , if it does not already have one. The returned value is the sheet's mirror.
Common Lisp Interface Manager 2.0 User's Guide - 7 Aug 2017