If you want to set a protective stop price level with an indicator, but you only want it effective under some conditions (like time of day), here is how it can be done:
If Time<=3:50PM then StopPriceIndicator Else *
The above code (which uses the unpublished and unsupported NULL character *) would cause the stop order to cancel on the 3:55 bar in a 5 minute bar chart. If you want it effective only certain times you could use:
If X<=Time<=Y then StopPriceIndicator Else *
How about stopping only in November when the price is < 116:
If AND2(NovemberFlag,A<B(Close,116)) then StopPriceIndicator Else *