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>How is it with entering of characters? The users will enter their names and address etc. Any ideas?
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>Do I need to require a 17 inch screen? I can imagine if they buy a 14 inch screen it get's difficult with the large controls...

Not recommended. Take a look at a modern building directory. They display a large on-screen 'keyboard' (upper case only) so you enter the first few characters of a company name to narrow the search and then pick from a list - but you'd need the patience of Job to enter a full name AND address!

You can also find them in some modern record or book stores - take a look, give them a try.