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   [  Technical notes  ]


   BIOS
   ----
   NGX uses standard EGA/MCGA/VGA BIOS calls to handle the fonts/palettes.


   TSR state
   ---------
   NGX, as a TSR, hooks interrupts 08h, 09h, 10h, 13h, 16h, and 28h. It
   executes from within 08h or 28h within one second from keypress if
   interrupts and DOS are not busy.

   On popup, NGX reads, and restores on exit: stack info, int 1bh, 23h, and
   24h vectors, PSP, DTA, extended error info, break state, and cursor. UMB
   links are not accessed.

   The EGAlines feature does not perform a video mode set; active video page
   is assumed to be zero. All screen writing is sent directly to display
   memory.

   Palette, screen font, and attribute blink status are not restored.


   File handles
   ------------
   NGX opens a database file in read-only mode (00h). While NGX is popped
   up, one database file is open at a time. Output file is opened in r/w
   mode (02h).


   Memory requirements (in kb)
   -------------------
                               Running     Resident
                               -------     --------
   NGX.COM                     51          21 - 51 (*)
   NGX().COM                   28          n/a

   * Depending on INI file configuration


   Mouse
   -----
   Guaranteed no mouse support.

   .