Use the source view on the main window to do the following:

  Location             Function
  -------              ---------

  Source display       Display program source code, and, optionally,
                       compiler-generated line numbers to the left
                       of the code.

  Breakpoint           Set breakpoints on specific source lines or
     toggles           routines in your program, check breakpoint
                       status, and activate or deactivate breakpoints.

  Current line         Identify the line of source code that will be
     indicator         executed when program execution resumes.

  Call stack           Identify the sequence of routine calls on
                       the stack.