Comprehensive example

A more comprehensive example of PISA usage `pisa_demo' can be found in the pisa directory ($PISA_DIR). From the C-shell pisa_demo is defined as a command so just run it as any of the applications. From ICL the pisa_demo procedure needs to be loaded before running, this is achieved just by typing the procedure name pisa_demo followed by the invocation pisa_demo `device_name'.