Doors - SynchroFans
https://synchronetbbs.org/index.php/downloads/category/3-doors
Released on June 10, 2004 by Rob Jacob. This allows you to register NetRunner with any name and serial number you like. Check out the web version of NetRunner now called MatrixRunner under
How To Add DOS doors to Raspberry Pi Mystic
http://cyberiabbs.zapto.org/dispfile.php?textfile=gfiles/mystic/dosdoors-howto.txt&title=How+To+Add+DOS+doors+to+Raspberry+Pi+Mystic
This tutorial is intended for BBS sysops who wish to run DOS door games on their Raspberry Pi (or other ARM device)