Modifies the characteristics of a device or the paths used to
    access that device.

    For synchronous completion, use the Set Device Characteristics
    and Wait ($SET_DEVICEW) service. The $SET_DEVICEW service is
    identical to the $SET_DEVICE service, except that $SET_DEVICEW
    returns to the caller only after the requested action has taken
    effect.

    For additional information about system service completion, see
    the Synchronize ($SYNCH) service.

    Format

      SYS$SET_DEVICE  [efn] [,chan] [,devnam] ,itmlst [,iosb]

                      [,astadr] [,astprm] [,nullarg]

    C Prototype

      int sys$set_device  (unsigned int efn, unsigned short int chan,

                          void *devnam, void *itmlst, struct _iosb

                          *iosb, void (*astadr)(__unknown_params),

                          int astprm, struct_generic_64 *nullarg);