thanks to all
seems odd that after the unintelligible (to a layman) ballyhoo when .Net was introduced and proclaimed to be....well whatever it was, that it should all now be so quiet in the back rows. I don't consider this an explanation (thanks for the link M-B.
The .NET Framework 4 Client Profile is a subset of the .NET Framework 4 that is optimized for client applications. It provides functionality for most client applications, including Windows Presentation Foundation (WPF), Windows Forms, Windows Communication Foundation (WCF), and ClickOnce features. This enables faster deployment and a smaller install package for applications that target the .NET Framework 4 Client Profile.
I'll give the updates for that a miss for now, mostly as a pointless exercise in independence and self-determination.