Aperture is a 32-bit application that redirects the standard input and output of console applications to a connected socket handle in the spirit of the old PC Micro "DoorWay" program. This can be used to turn an ordinary console application into a BBS door.
aperture.exe -H<handle> -N<node> -- <command> <arguments>
Node is unnecessary. You can use -N1 as a default.
Aperture makes use of the R&M Software RMLib library by Rick Parrish.