We have an old VB6 app that uses the map, toolbar and toc controls. On the toolbar, we've added the custom menu so users can add other built-in tools or tools they've created. One of our customers would like us to build a couple of custom tools for them. They are using version 10.0 and most users will only have the engine runtime installed. The walkthroughs that I've seen seem to deal more with ArcGIS Desktop and tools built using ESRI.ArcGIS.Desktop.AddIns won't install on a machine that doesn't have Desktop. Our customer wants one tool that will query the "Loc_Num" field against a specific set of layers and another that will do an address lookup. I've spent about 5 days on this and have gone through numerous walkthroughs/code samples and have gotten nowhere.