Hi Guys, I trade mechanical system using custom developed software and IB as a broker. At the moment, I can be long/short or flat... I was thinking recently if I could easily go T-bill instead? What is the instrument for that? Also, I'm not sure how IB looks at my T-bill holding... for example, will they count it as cash against my margin requirements and will they liquidate that position first before closing out my ES position? any experience?