The PLAN program DEMO consists of a number of program segments which were initially created for the test of ConPLAN and $PLAN. It executes every in ConPLAN available machine instructions and macros in various modes and tests the screen support functions as well as file I/O. 
DEMO can be started by calling the procedures P.DEMO1 and P.DEMO2 in this sequence. The procedure P.DEMO3 can be tested if a genuine ICL data tape is available to read from (the contents of the tape would be irrelevant).