GazeParser consists of two components. GazeParser is a python module for stimulus presentation, data conversion and analysis. SimpleGazeTracker is an application for gaze recording written in C++. It is unnecessary to install SimpleGazeTracker on PCs that will not be used for gaze recording.
If your PC is powerful enough, you can install both GazeParser and SimpleGazeTracker on a single PC. See Single-PC recording for detail.