VMS Help TCPIP Services, Programming Interfaces, RPC Client Routines, clnt_control, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 handle
    A pointer to a client handle created by any of the client handle
    creation routines.
 code
    A code designating the type of information to be set or
    retrieved.
 info
    A pointer to a buffer containing the information for a SET
    operation or the results of a GET operation.