>Any ideas? The tab key quit working in all DOS programs and the command prompt in a dos window on a Windows ME workstation. It is only happening on one workstation at one location (out of hundreds). I originally thought it was our FPD26 program, but it turns out to be in all dos programs that this is happening. Any ideas what could cause this?

No idea, just two usual suspects.

While running fpd2.6 under w98, I've often noticed that it sometimes behaved as if alt or ctrl was pressed and not released. Repeated pressing of these keys reset the behavior. Never had a way to surely reproduce this, nor to cure it programmatically.

The other usual suspect may be the accessibility options, which have a habit of being turned on behind my back and causing the keyboard or mouse to start behaving in very interesting ways.
The only option was to turn it all permanently off, then remove the icon from the command panel, just in case. I wish I knew how to turn off the "you were holding the shift key for more than 7 seconds" dialogue - one of the most annoying things I ever saw. I'm holding the shift key because I've stopped typing because I need to think, and this surely helps me to concentrate.