      \fitem{system}(cmd:string), \vImpure: This function hands the
      argument command to the command interpreter sh.  The calling process
      waits for the shell to finish executing the command, ignoring SIGINT
      and SIGQUIT, and blocking SIGCHLD. A false boolean value is returned
      if an error occured (in this case an error message is issued). 


      
      %%% -------------------------------------------------------

