TDRSDK Software Development Kit allows software developers to create custom applications for the TDR100 Time Domain Reflectometer. The kit consists of a DLL (Dynamically Linked Library) file that gives developers access to the entire TDR100 command set to customize and simplify the user-interface for the TDR100. RS-232 serial communications with the TDR100 is supported at 9.6, 19.2, or 57.6 kbps. The TDR100COM.DLL runs on Windows® 95, 98, NT, 2000 or XP. Supported languages are C , Pascal, and Visual Basic®. Code written using Visual Basic in Microsoft Excel allows access to all Excel functions and graphing. Simple example programs are provided in each of the supported languages.