The 3+ network operating system for Macintosh computers and MS-DOS compatible computers provides transparent file sharing between Macintosh and IBM PC-compatible computers. The 3+ software is only AFP-compatible in that you can use the software at the same time that you have an AppleShare volume mounted. The 3+ software was written before AFP specifications were made public, and does not implement any AFP calls. It has not been updated to use AFP.
3+Share software also looks quite different than AppleShare software. You cannot mount a 3+Share volume using the standard AppleShare chooser method. The interface for such tasks as network administration, setting passwords, and setting access privileges is not the same as the AppleShare interface, either.
The 3+ network operating system is an alternative to the AppleShare File Server and Print Server. It provides file service, print service, naming service, and internetwork routing service, and should be considered compatible with AppleShare only in that it doesn't actively interfere.