groff: Traps

 
 5.24 Traps
 ==========
 
 "Traps" are locations that, when reached, call a specified macro.  These
 traps can occur at a given location on the page, at a given location in
 the current diversion, at a blank line, after a certain number of input
 lines, or at the end of input.
 
    Setting a trap is also called "planting".  It is also said that a
 trap is "sprung" if the associated macro is executed.
 

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