=> R1 = &5E (reason code)
This service is issued by MessageTrans to warn that all files have been closed. It is only needed by applications which use direct pointers into message files - they must re-open message files with MessageTrans_OpenFile and recache pointers. If applications are using direct pointers (e.g. indirected icons) with MessageTrans_MakeMenus then they will need to close menus and re-make them if this service is issued. Use Wimp_GetMenuState to check whether your own application's menu is open - close it if it is.
See PRM 3, page 741
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