The difficulty I have with pc's is that their response is context sensitive. Fail to check one box, dot one i, cross one t, you get no notification but it doesn't work. Because they are sealed box devices a novice has no clue what has failed to happen. This is what computer savvy people fail to appreciate when giving out instructions. Things that seem obvious really are not. Computers do not follow logic the way that their aficionados believe they do because they have been built by a human being and people who design user interface systems have their own idiosyncrasie s and are not as logical as they like to think they are.