Change_bar_commands

   The bar commands control the insertion of vertical bars (|) at
   the beginning of lines of text. The bars (usually called change
   bars) are normally inserted to indicate where changes in text
   have occurred since the previous edition of a document. You can
   specify a character other than the default character (vertical
   bars) to indicate changes by using the /CHANGE_BAR qualifier to
   the RUNOFF command line.

   Formats

     .ENABLE BAR

     .DISABLE BAR

     .BEGIN BAR

     .END BAR

   Abreviated formats

     .EBB

     .DBB

     .BB

     .EB
 

Additional information available:

Default         .ENABLE_BAR     .DISABLE_BAR    .BEGIN_BAR      .END_BAR