Hi Nicklas,
Regarding the Tobii.EyeX.Client.dll there are documented header files, C and C++ samples and a Developer’s Guide included in the EyeX SDK for C/C++.
The “Minimal…”-samples are pure C and show how a connection is set up from a client application to the EyeX Engine, and also how data streams and status notifications are set up.
The C++ samples exemplifies the EyeX Activatable behavior, and how the Query-Snapshot handling can be implemented using a repository of interactors on the client side.
The Developer’s Guide explains the concepts used in the API, such as interactor, behavior, query, snapshot, event and so forth.