I second the nomination for Beyond Compare. I've been using it for years and it has saved me many hours while debugging code that no longer works after making a bunch of changes. BC not only makes it easy to see the differences, but also makes it easy to quickly copy and paste sections of code from one file to another. Steve Rapinchuk William Couture says: >I've been using "Beyond Compare" for source code comparisons. >http://www.scootersoftware.com/ >Don't know if can be told that "lines that start with ' should be >excluded", but it does know how to ignore C comments. >Bill > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist