SilcBuffer silc_client_attributes_request(SilcAttribute attribute, ...);

    Constructs a Requested Attributes buffer. If the `attribute' is zero (0)
    then all attributes are requested.  Alternatively, `attribute' and
    all variable arguments can each be requested attribute.  In this case
    the last must be set to zero (0) to complete the variable list of
    requested attributes.  See SilcAttribute for all attributes.
    You can give the returned buffer as argument to for example
    silc_client_get_client_by_id_resolve function.

    Request all attributes
    buffer = silc_client_attributes_request(0);

    Request only the following attributes
    buffer = silc_client_attributes_request(SILC_ATTRIBUTE_USER_INFO,
                                            SILC_ATTRIBUTE_SERVICE,
                                            SILC_ATTRIBUTE_MOOD, 0);