On Mon, 23 Mar 2015 09:17:37 +0100, R.Wieser wrote:

And now for going technical:
I've found some MSDN documentation about the plugin objects (what they are
comprised of), but not enough to be able to progress that way. If anyone
has an example project including both the server as well as the client ends
of the plugins/communication it would be appriciated.

If you're referring to the PluginDlls property of IMsTscAdvancedSettings,
the plugin is a Virtual Channel client DLL.

Googling for (with quotes): "virtual channel client" "dll"
Will get you links that are mostly programming oriented. e.g.

http://www.codeproject.com/Articles/87875/User-Mode-Transport-of-the-Library-Via-Virtual-Cha

The Terminal Services ActiveX Client (mstscax.dll) seems to be the only
module that provides the plugin feature.

PS) CodeProject is a very good source for Windows API programming.