Enable Concurrent Sessions on XP

  1. Open Registry Editor (Start, Run, regedit).
  2. Navigate to: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control \TerminalServer\Licensing Core.
  3. Create a new REG_DWORD value named EnableConcurrentSessions.
  4. Set the value to 1.
  5. Exit the editor.

(via joe boy)