I’ve been searching for an answer to this for a long time with no luck. Is there any way to test the multiplayer aspects of a script/mod locally with just one steam account? For instance, could I create a listen server and somehow join it as a second player with a second instance of gmod? Or, do you absolutely need at least two steam accounts and a second OS to run two instances simultaneously even when just testing locally?
How do developers test their multiplayer code locally by themselves? The bots are of very little help.