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(elisp)Information from Markers

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Information from Markers
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   This section describes the functions for accessing the components of
a marker object.

 - Function: marker-position marker
     This function returns the position that MARKER points to, or `nil'
     if it points nowhere.

 - Function: marker-buffer marker
     This function returns the buffer that MARKER points into, or `nil'
     if it points nowhere.

          (setq m (make-marker))
               => #<marker in no buffer>
          (marker-position m)
               => nil
          (marker-buffer m)
               => nil
          
          (set-marker m 3770 (current-buffer))
               => #<marker at 3770 in markers.texi>
          (marker-buffer m)
               => #<buffer markers.texi>
          (marker-position m)
               => 3770

 - Function: buffer-has-markers-at position
     This function returns `t' if one or more markers point at position
     POSITION in the current buffer.