sends a beep to your terminal when level>=threshold.
default level and threshold are all 5.
#bell option [option] [frequency] [duration]
This option is for windows only: 0: soundcard, 1: speaker.
For speaker, user can specify the frequency (all) and duration (not for 95/98/Me) of the beep.
example:
#action {tells you} {#bell}
#action {you are in danger!!!} {#bell 9}
In normal case, both action will chime you.
Now you only want the 2nd case to send u a beep:
#bell threshold 6
Since #bell == #bell 5 is below the threshold 6, only
the second action will send a real beep.