F9 - Break
 Mark a line of code that MrDebug should stop on.
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 Set a break point on the current line of code. If the flashing cursor is not
 on a valid line of executable code the break point will not be set.

 The break point will then be added to the break point list.

 Pressing F9 on a line that already has a break point will remove the break
 point from that line of code

 Should you save your setup, or have auto-setup set to on, then when you quit
 MrDebug the break point will be saved. The next time that you start the
 debugger with the saved settings the break point will continue to be active.

 WARNING: If you change the source code, re-compile and re-link, the break
          point may not be on the same line if you had inserted any lines
          before the break point.

 Please Note: when running your program with the Fast Run mode, break points
 are ignored.