OCT Host (OCTHost.exe) is a Windows Forms-based GUI that provides a subset of the features of the Hardware Control Tool (also via the AxsunOCTControl library), including toggling laser emission on/off, indicating hardware connectivity state, adjusting the K-clock delay, and controlling a motorized variable delay line (if installed). OCT Host also provides more advanced laser diagnostics, maintenance, and debugging information, as well as system firmware upgrade capabilities. EDAQ functionally in OCT Host is limited to low-level operations such as FPGA register reading/writing and setting power-on defaults in non-volatile RAM.