ABSTRACT: The STK® user interface (UI) Plugin is a COM component loaded at run-time. The UI Plugin stays active for as long as the STK® Desktop Application is running. The UI Plugin extends the STK® Desktop Application’s user interface by adding a custom toolbar, menu, and control window. The following is a description of the dBmSleUIPlugin, capable of communicating with dBm’s SLE900 Series Satellite Link Emulators via a LAN connection. This manual assumes the reader is familiar with the capabilities, operation and control of the SLE900 product and the STK® Desktop Application.