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TRON traces the execution of program statements.
 
TRON
TROFF
 
Usage Notes
    ■ In the QBX environment, executing a TRON statement has the same
      effect as selecting Trace On from the Debug menu--each statement is
      highlighted on the screen as it executes.
    ■ The TROFF statement turns off the program trace.
    ■ The TRON and TROFF statements only display line numbers when compiled
      with the Debug option or the /D option on the BC command line.