I know I can receive messages with the code below in c#, how do I send to vb6, and receive in vb6, and send from vb6?

    [System.Security.Permissions.PermissionSet(System.Security.Permissions.SecurityAction.Demand, Name = "FullTrust")]
    protected override void WndProc(ref Message m)
    {

        int _iWParam = (int)m.WParam;
        int _iLParam = (int)m.LParam;
		switch ((ECGCardioCard.APIMessage)m.WParam)
		{
			// handling code goes here
		}
        base.WndProc(ref m);
    }