Probably something of a trivial question for those who know: Can anyone out there confirm for me whether ANSI C is meant to be a case sensitive, or insensitive languge; and whether the Keil compiler complies with this. Yours gratefully, Richard Roebuck. P.S. Am I the only one who finds that the tick box to send 'an e-mail message when someone posts to this thread' option doesn't work? Do I need to set a specific option on the browser to enable this?