Roblox multi instance, explained

Roblox multi instance means more than one Player process. MultiRoblox and similar tools chase multiple Roblox instances on one Windows login, not Studio servers.

What it is not

This is not cloud hosting and not a Studio playtest server. Each client still talks to Roblox servers with a normal account.

Safer paths

If a tutorial tells you to download Process Explorer from a mirror instead of Microsoft, stop. Prefer this site or Microsoft Store Roblox plus desktop Player.