Hi Otto,

You are setting a breakpoint in the code.

From help::

Set and Clear a Breakpoint


You set a breakpoint to suspend execution at a specific statement in a
procedure; for example, where you suspect problems may exist. You clear
breakpoints when you no longer need them to stop execution.

To set a breakpoint

Position the insertion point anywhere in a line of the procedure where you
want execution to halt.


On the Debug menu, click Toggle Breakpoint (F9), click next to the statement
in the Margin Indicator Bar (if visible), or use the toolbar shortcut: .
The breakpoint is added and the line is set to the breakpoint color defined
on the Editor Format tab in the Options dialog box.

If you set a breakpoint on a line that contains several statements separated
by colons (:), the break always occurs at the first statement on the line.

To clear a breakpoint

Position the insertion point anywhere on a line of the procedure containing
the breakpoint.


From the Debug menu, choose Toggle Breakpoint (F9), or click next to the
statement in the Margin Indicator Bar (if visible.)


The breakpoint is cleared and highlighting is removed.
To clear all breakpoints in the application

From the Debug menu, choose Clear All Breakpoints (CTRL+SHIFT+F9).
Note Breakpoints set in code are not saved when you save your code

---
Regards,
Norman



"Otto Moehrbach" wrote in message
...
Excel 2002, WinXP
Within the VBE, within a module, there is a vertical bar at the left side
of
the module area. If I click in that bar to the left of a line of code, I
get a dark red dot in that bar and that line of code is highlighted the
same
dark red.
What is this?
What is its purpose?
Does it effect the operation of the code? If so, how?
Thanks for your help. Otto