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Hi @tw2018, whilst there is no blink detection within the Tobii Core SDK, you can indeed configure that a click should occur when gaze rests on a particular area for a predetermined amount of time. You can include a custom timer to these routinese to catch blinks as desired. The means by which a click is registered through gaze dwelling is demonstrated in the Interaction Samples as included with the Core SDK which you can download @ https://github.com/Tobii/interaction-samples
With regards to syntax, There’s a GazeAwareBehavior that may be attached to an interactor, which has two fields: Mode (GazeAwareMode) & DelayTime (TimeSpan). If Mode is set to GazeAwareMode::Delayed, then HasGaze event can be used to generate a mouse click. You may wish to check out WithActivatable / WhenActivated.
Regarding a ready to launch track status camera window, unfortunately there is no such feature ready launch within the Core SDK Interaction API. Accordingly, it would be necessary to construct a custom application implementing the EyePositionData / EyePositionStream data to graphically show the eyes within a window.
You can read more regarding the idealised locations necessary to calibrate the response @ https://www.tobiipro.com/learn-and-support/learn/steps-in-an-eye-racking-study/run/how-to-position-the-participant-and-the-eye-tracker/. Hopefully we have answered your questions, but please let us know if you require any further information.