Originally Posted by Global Rules
- Multi-clienting
Multi-clienting occurs when two or more clients are connected to any one room from the same network. When this occurs, (MC) appears next to the names of multi-clienting account. Multi-clienting is forbidden in any official servers. Players are allowed multi-client in private rooms.
I believe a room is no longer considered private if it's globalled, so no you can't multiclient in a globalled bet server, in a normal player made server it's ok tho.