DOORS.MH

This command allows you to access various features external to the BBS 
program that can be provided by individual systems. Simply execute the 
DOORS command for a list of external facilities, if any, that are available 
on this system.
     The list of programs available can change depending on which message 
board is active when the DOORS command is given. Individual DOOR listings 
are provided as a SYSOP-configurable option.