How to do bidirectional or reverse debugging of programs?

Question

Has anyone actually used a reversable debugger? The only product that Google turns up is UndoDB. It is for apparently for Linux only.

Answer 1

Yes, I've used it back in the 90th.. The Watcom C Debugger (understood FORTRAN and most other languages as well) had the option to let you step back and forward in time.

It's great, but not a big new thing...