/sys$common/syshlp/helplib.hlb RPCGEN, Qualifiers, /TRANSPORT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /TRANSPORT [= (TCP, UDP)]

    Optional.
    DIGITAL UNIX equivalent: -s
    Default: Create a server-side skeleton that supports both
    protocols.

    Creates a server-side skeleton that includes a main routine that
    uses the given transport. The supported transports are UDP and
    TCP. To compile a server that supports multiple transports,
    specify both.