<\body> In a ``shell session'' it is possible to evaluate shell commands. All input and output is verbatim. No particular command-line utilities (such as completion mechanisms) have been implemented yet. The output of the shell command is displayed gradually as the program executes. In a `` session'' you can evaluate / programs. The input should be verbatim text. The input is evaluated and the result is displayed. No gradual output mechanism has been implemented yet for session. <\initial> <\collection>