Not really. General rule is the things in the property sheet and Intellisense are properties. But frankly that's not always true, because all the Web Connection controls derive from the .NET controls that have a lot more properties than the Fox ones. I've mostly hidden properties that aren't supported but there are still a few that aren't.
The best way to know what's a property and what's an attribute is by looking at the Fox classes and checking what's a property (including inheritance structure) in the help file.
+++ Rick ---