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copied!<blockquote> <p>I want the other components to connect to the GUI that's already running, rather than start a new instance of the exe.</p> </blockquote> <p>The trick is to remember that in a ActiveX EXE it can be setup so that there is only one instance of the LIBRARY running. It is correct that you can't reach and just pluck a given instance of a class across process boundary. However the ActiveX EXE can be setup so that the GLOBAL variables are accessible by ANY instance of classes. </p> <p>How to exactly to do this gets a little complex. You can use a ActiveX EXE as a normal EXE the main difference is that you HAVE to use Sub Main. You can also check to see if it run standalone or not. Now I am assuming this is the case with MarkJ's application. </p> <p>If this is the case what you need to is create a application class and set it up so that that when it is created (by using Class_Initialize) that it is populated with the current running instances of forms and collections. </p> <p>I strongly recommend that you create an ActiveX DLL (not EXE) that has nothing but classes to implemented as interfaces. Instead going of going</p> <pre><code>'Class ThisGUIApp Public MainForm as Form </code></pre> <p>You create an interface that has all the properties and methods needed to access the elements of the mainform. Then you go</p> <pre><code>'Class ThisGUIApp Public MainForm as IMainForm Private Sub Class_Initialize Set MainForm = frmMyMainForm End Sub 'Form frmMyMainForm Implements IMainForm </code></pre> <p>You do this because while you can send a Form across application process things get wonky when you try to access it members and controls. If you assigned via an interface then the connection is a lot more solid. Plus it better documents the type of things you are trying to do.</p>

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