groff: Diversion Traps

 
 5.24.2 Diversion Traps
 ----------------------
 
  -- Request: .dt [dist macro]
      Set a trap _within_ a diversion.  DIST is the location of the trap
      (identical to the 'wh' request; default scaling indicator is 'v')
      and MACRO is the name of the macro to be invoked.  If called
      without arguments, the diversion trap is removed.
 
      Note that there exists only a single diversion trap.
 
      The number register '.t' still works within diversions.  See
      Diversions, for more information.