HistWrap

HistWrap = YES | No:  Controls whether the command history recall "wraps" 
when you reach the top or bottom of the list.  The default setting enables 
wrapping, so the list appears "circular".  If HistWrap is set to No, 
history recall will stop at the beginning and end of the list rather than 
wrapping.  This setting affects history recall at the prompt only; the 
command history window never wraps.