This function changes the system behavior when SolidDesigner to processing
commands.

There are four inputs to the function:

Chg Prompt When Busy: When enabled, this will cause the prompt to change
           to the value in "Prompt".

Prompt: When "Chg Prompt When Busy" is enabled, this is the text that will
        be displayed when SolidDesigner is processing data, for example
        when pressing OK or NEXT.

Beep When Done: When enabled, this will cause SolidDesigner to beep when
                it is finished with a command if the command takes more
                than the amount of time specified in "Interval(sec)".

Interval(sec): This is the length of time (in seconds) that a command must
               take before SolidDesigner will beep. This is only valid if
               "Beep When Done" is enabled.

Limitations:

*When "Beep When Done" is enabled the first time, it will beep to let you
 know what the beep sounds like. But, this only works the first time;
 turning it off, then back on will not cause it to beep. You can use the
 command (vcd::short_tone) to hear the beep. If you do not hear a beep
 when executing this command, there may be a problem with the speaker on
 your system.

*This function has only been tested on HP-UX. The changing of the prompt
 should work on any platform, but the beep portion may not work on NT.

*When "Beep When Done" is enabled, you may get beeps at times when you are
 not expecting, or a double beep. This is because it will beep whenever 
 SolidDesigner is expecting user input or when a command is completed and
 SolidDesigner is back to the "Click a command" prompt.