Error Dialog
Windows has multiple routines to raise many kinds of operational errors. Besides being irritating, such errors can affect the operation of your machine, perhaps even causing you to have to turn the machine off and re-starting it.
Example: "I clicked the toolbar 'Copy' button to copy a selected line".
There are many kinds of errors. Often CAD programs suffer from math errors when scaling calculations result in numbers too big for the Windows math unit to handle.
We try to avoid errors altogether, and to trap those that do slip through.
When an error does occur, we display a dialog that may be able to send us information helpful in determining the cause.