NTSTATUS MmSessionDelete( ULONG SessionId ); Routine Description: Called from NtSetSystemInformation() to detach from an existing session space in the calling process. An error is returned if the calling process has no session Space. Arguments: SessionId - Supplies the session id to delete. Return Value: STATUS_SUCCESS on success, STATUS_UNABLE_TO_FREE_VM on failure. This process will not be able to access session space anymore upon a successful return. If this is the last process in the session then the entire session is torn down. Environment: Kernel mode, no mutexes held.