Question about Tradestation's radarscreen

Hello,
I have some questions about radarscreen, please answer only if you are 100% sure.

1) Does radarscreen works premarket? If yes, at what time does it start scanning? 4AM east or 8am?
2) Can I create Easylanguage code to check for conditions and have them in a RS column?
3) If 2) is yes, can I scan for conditions on sub minute time interval (like 20 seconds)?
 
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