/sys$common/syshlp/HELPLIB.HLB  —  DECnet-Plus  DCL Commands, SET  HOST  /X29  Qualifiers  /USER_DATA=string
       /NOUSER_DATA

    (Default=/NOUSER_DATA)

    Use this qualifier to specify a string of user data that is  sent
    to the remote DTE when the call is established.  The maximum size
    of the string is 12 characters,  unless   /FAST_SELECT  has  been
    specified, in which case it is 124 characters.
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