Currently, whenever you open a vrchat://launch link, a VRChat shortcut with a world ID, or hit "Test" when building a world in Unity, an entirely new VRChat process will launch, even if you already have the game open.

For world debugging, closing the game and relaunching every time you make an edit that you need to test can eat up a lot of time, and it's gonna happen way more often when Udon ships.

Proposed functionality: opening a link or hitting test with the game already open makes your current VRChat process immediately leave the current instance and load into the instance defined. Perhaps some kind of flag could be added to URLs for situations where multi-clienting is necessary.