PvPGN is the Battle.net emulator, which used as an intermediary for playing in network with Starcraft, Warcraft 2/3, Diablo 1/2.
Also in this emulator developers built WOL support (Westwood On-Line, for games Red Alert 2, Yuri Revenge, etc.). WOL is tested, at the time of writing this text, and works well only with the Red Alert 2.
Generally, there are several Battle.net emulators, such as FSGS, BNetD, but their development has long stopped, and they have some space capabilities than that of PvPGN.
PvPGN exists in the source code and kept developers.