General info - PCBoard @ Macros 

  In some of your display files you may want to display information that is
  specific to the caller currently viewing the file (e.g., name, connect
  speed, node number, etc.).  Another possibility is that you may want to
  control the display of some of your files so that they pause at a
  particular point.

  PCBoard uses @ macros to help you accomplish these tasks.  These macros
  are special codes that you can enter in text files to make PCBoard
  display certain information or perform a particular action.  All macros
  must begin and end with the @ character with the text between being
  in UPPERCASE.