$SET_DEFAULT_TRANSW

   Sets or clears the default transaction of the calling process.

   $SET_DEFAULT_TRANSW always waits for the request to complete
   before returning to the caller. Other than this, it is identical
   to $SET_DEFAULT_TRANS.

   Format

     SYS$SET_DEFAULT_TRANSW  [efn] ,[flags] ,iosb [,[astadr]

                             ,[astprm] ,[new_tid] ,[old_tid]]

   C Prototype

     int sys$set_default_transw  (unsigned int efn, unsigned int

                                 flags, struct _iosb *iosb,...);