Invalidate the display box. The window updates either when the <<Update Window message is sent or when the operating system has time for the update. See <<Reshow for another method.
Invalidates the display box and updates the window with the new content. See <<Inval and <<Update Window messages if more control over timing of the update is required.
Updates or refreshes the window holding the display box if there are invalidated regions. See also <<Inval and <<Reshow messages for additional methods.