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[Remko]

Actually... it does.
It's called WinStationConnect, an undocumented function from winsta.dll. It's present in JwaWinsta.pas (Jedi Apilib):

Delphi-Quellcode:

function WinStationConnectW(hServer: Handle; SessionId: DWORD;
  TargetSessionId: DWORD; pPassword: LPWSTR;
  bWait: BOOL): Boolean; stdcall;

and also in Jwscl Terminal Server unit (TJwWTSSession.Connect).

If you switch to a session with the same user you don't need to specify a password in which case you pass empty string (and not nil!).