The C programming language
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This paper describes the evolution to date of a flexible debugger for C programs on the Blit, a multi-processing bitmap terminal. The debugger is of interest for the following reasons: it is assisted by the terminal software's elegant separation of the debugger process from its subject process. it resides autonomously in the terminal and is bound dynamically to arbitrary subject processes. it executes asynchronously with its subject. its implementation is distributed as a small process in the terminal and a large process in the host timesharing system. its user interface uses graphics and a mouse. An opinion about the most fruitful direction for further application of graphics is offered.