Practical guides for running multiple Claude Desktop and Claude Code instances on Windows - multiple accounts, isolated MCP servers, parallel agents, and more.
Claude keeps one account signed in. Three ways to use several Claude accounts at once on Windows: browser profiles, a manual launch flag, or a dedicated app - and where each one breaks.
Your second account's Google or email sign-in lands in your other Claude window? Why Windows does that, the free "Sign in with a code" fix, and what to do with Google.
Claude's account switcher only works for accounts on the same email address. How to use it, what to do with two different emails, and the switching bugs to know about.
Why Cowork can't find its virtual machine on an extra Claude account, how to fix it by hand, and why Windows runs Cowork in only one account at a time.
Claude refuses to reopen after an update, with error 0x80070020? What actually blocks it, and what gets you back in - from waiting two minutes to signing out of Windows.
Fan always on, mouse lagging, processor idle? On laptops with two graphics cards, Claude can draw on the wrong one. How to check, and the free one-minute fix - with before/after measurements.
Two Windows apps that run several Claude Desktop accounts side by side. What each one does better - Microsoft Store and other AI engines on one side, Google sign-in and Cowork on the other.
Other apps take the focus but stay hidden behind Claude? Why the window gets stuck on top after updates or Cowork, and four ways to unstick it - from a restart to one PowerShell command.
Run Claude Desktop and Claude Code side by side with fully isolated accounts, MCP servers and settings - one profile per context, no logging out.
Stop sharing one MCP config across every project. Give each profile its own isolated set of MCP servers, with a built-in validated JSON editor.
Run several Claude Code agents at once without losing track. Keep sessions isolated and see which one is working, waiting, done or stalled.