application-about-handler in System Menus

When the current eventspace is the initial eventspace, this procedure retrieves or installs a thunk that is called when the user selects the application About menu item in Mac OS X. The thunk is always called in the initial eventspace's handler thread (as a callback).

The default handler displays a generic PLT Scheme dialog.

• (application-about-handler) -> procedure of no arguments

  If the current eventspace is the initial eventspace, returns the current handler, otherwise returns void.

  
  

• (application-about-handler handler-thunk) -> void
     handler-thunk : procedure of no arguments

  If the current eventspace is the initial eventspace, sets the current handler, otherwise does nothing.