>We have used http://wpfinstanceawareapp.codeplex.com/SourceControl/changeset/view/53538#5 30407
That's an interesting piece of code. There are some bits that surprised me: Assert, Translate(SID), AbandonedMutexException, MutexSecurity UIPermission, etc. There is a lot more code here than I have used to get the same result in WinForms, so I'm embarrassed to presume my code was lacking rigor. I'm going to study this code and see what tricks he knows that I don't. Thanks for the link, Greg
