It is assumed that the reader is familiar with the basic procedures to run a job interactively on the Connection Machine, and how to use X windows. The file volrend is actually a Tcl script, which is interpreted by volrend.exe. So you can either run it by typing the command ``volrend'' or by typing ``volrend.exe volrend''. Under DJM, you can run it directly with ``jrun -export - volrend.exe volrend''.