C# Application to Launch and Monitor a VB6 Application

I have an old application written in Visual Basic 6. We'd love nothing more than to retire it but can't yet. So, I'm trying to build a C# program that will launch and monitor the VB 6 application. Getting the application to launch and check for its exit state is trivial. The entire application is here:

	static class Program
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main()
		{
			Process remoteProcess = Process.Start(@"C:\Program Files (x86)\Test\MyProgram.exe", "user1");
			remoteProcess.EnableRaisingEvents = true;
			remoteProcess.Exited += RemoteProcess_Exited;
			remoteProcess.WaitForExit();
		}

		private static void RemoteProcess_Exited(object sender, EventArgs e)
		{
			Process remoteProcess = sender as Process;
			if (remoteProcess.ExitCode != 0)
			{
				MessageBox.Show($"The program terminated abnormally (exit code {remoteProcess.ExitCode})");
			}
		}
	}

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This works just fine for what it does. However, I'd like to be able to monitor the application for more details like when the user opens another form from within the application. It's an old MDI application and I know the VB6 form class is something like ThunderRT6Form. I'm guessing I'll have to get into some lower level Windows hooks to make this work but I don't really know where I should start. Anyone have any ideas?