Single exe for multiple rooms

i will build my game for windows and deploy it to a vps on internet. running separate exe file for each room will consume too much memory. my game is turnbased so single instance can handle 100 rooms.

for each connection there will be a player object on the server and this player will be created on other clients. how can i limit this creation? i want players A,B,C to see their player objects like they in a private room and players D,E,F to see their player object. how can i do that?