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     Hidden lines are "unknown"  kludge lines. If enabled,  hidden lines
     will be displayed (in a different color) when reading msgs.

     A hidden line  is defined as  a line which  has the FidoNet  kludge
     char (^a,  ASCII 1)  as the  first char  and is  not on the list of
     internally or user defined known kludges.

     This keyword can be used globally and in a Random System group.

     IMPORTANT NOTE:

     In some conferences the hidden lines are used to give witty comment
     "between  the  lines"  in  the  plain  text,  but  generally  it is
     considered a  bad practice  and should  be avoided  because it  may
     cause severe technical problems if a witty comment in a hidden line
     happens  to  match  a   (perhaps  experimentally)  defined   kludge
     somewhere. It should also be  noted that hidden lines are  not kept
     in their original places when used in the JAM msgbase. This is  due
     to the way the JAM specification stores FidoNet kludges.