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 beep()              Generate a system beep
------------------------------------------------------------------------------
 Declaration
   system.hdr

 Syntax
   proc beep extern

 Arguments
   None.

 Return
   None.

 Description
   beep() generates a system beep by sending an ASCII character 7 to the
   console. The frequency and duration of the beep depends on the machine
   characteristics.

 Example
   #define EXAMPLE_SYSTEM
   #include example.hdr

   proc Test_beep
   beep()                       // sound a beep
   ? "Reindexing required"      // display a message
   wait                         // wait for keypress
   endproc

   proc main
   Test_beep()
   endproc