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║ GT-HELP ║ GTDOOR-*.BBS - Door Sub-menus
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    Door sub-menus are optional, and generally only appropriate for boards
    with LOTS of doors.  If you only have a few doors, you are not likely
    to need sub-menus.

    GT can support 26 door sub-menus, identified as A to Z.

    When working with sub-menus, the GTMENU.BBS generally lists the *types*
    of door available, rather than individual doors, eg :

                       G.  Game Doors
                       D.  Database Doors
                       U.  Utility Doors

    and the sub-menus G, D and U list the doors themselves in the same way
    as would originally be done for the GTDOORS.BBS.

    Note:   callers who know a particular door need not go through the
            sub-menu, ie door 22 could equally well be accessed from the
            main menu by O G 22 or just by O 22.


┌─────────────────────────────┐
│ Allocating the door numbers │
└─────────────────────────────┘

    There is no particular relationship between the sub menu and individual
    doors,  which continue to be numbered 1 to 999, so

        a)  You could decide to reserve numbers in blocks, eg :

                0-99        for doors in submenu G
                100-199     for doors in submenu D
                200-299     for doors in submenu U

        b)  You could just issue door numbers sequentially as you implement
            each one.

        c)  You could have some doors which are common to two or more
            submenus using the same door number.

