Hi, Thanks for the warm welcome. I was in programming line 4 years ago but now no longer in this line. As part of my master thesis, I am planning to develop an expert system and hope this forum would be helpful. It is actually base on the posted threads and members contribution. I was working on machine language (plc) and a little bit of c++ and visual basic. Okie that;s a brief info about me. Thank you - Shandra