Watching a variable

[bjb007]

Is there a way to watch the value of
a particular variable during script execution?

Debuggers I've used allow the input of a
variable name and stops execution
whenever the variable changes.

Another question...why does the Variable
Watcher window, when first opened during
a session, show values of variables from
a different script to the one being debugged?

Is there a way to clear unwanted variable?
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Wouldn't it? The first time I opened the
Variable Watcher window after posting
this question is displayed in a way it never
has before with a grey column at left where
a mouse click allows setting the condition for
a watchpoint.
However doesn't seem to have a facility to
catch any change in a variables value.

What did I do to get this alternate display?
No idea. Any suggestions?