How Do I...
You'll see a Debugger window if you run flawed code.
The debugger looks like the following:

Its five panes contain the following:
- error message (upper left)
- Shows a message that pinpoints the event that triggered the
debugger.
- message stack (middle left)
- Lists the messages (scripts or methods) that were running when the
debugger opened. Names are in the format:
class>>#script. The most recently run script is at the top,
and the first script sent is at the bottom.
- list of variables (middle)
- After you select a script from the message stack, it names the object that
received the selected script and any temporary variables of the selected
script. It functions like an Inspector window.
- variable values (middle right)
- Shows the value of a selected variable at the time the error
occurred. It also functions like an Inspector window.
- script (method) description (bottom)
- After you select a script from the message stack, it displays the
script's source code. The expression sent is highlighted.
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