Yes that is one of the header files I am using. So I fixed all of the code errors. But still get the Hyperterminal message cannot open csk_temp.txt. So my assumption is that there is either a format issue. Or I have not created the text file correctly. I created it in wordpad just a simple document full of about 4 "0" and a 1. So 0001 is whats in the document. Again not sure if that was the correct way to format that file or not.