Hey, I'm interested in trading the Dow E-mini, although I need some help understanding how the margin requirements work. IB says that the intraday initial margin is $1219, and intraday maintenance margin is $975. Does this mean that they subtract $1219 from my account when I purchase a contract, and I must maintain $975 cash in my account until I sell it? I just want to make sure I understand these terms right. Also, if my account is not a margin account, can I still trade futures under these margin regulations?