Quote from wercurna:
Can you explain FCM
FCM ?
Sorry. FCM is futures clearing merchant. Your introducing broker (IB) is the firm who you will execute your trades through and your FCM will clear your trades. The FCM is the one with the exchange memberships and who holds your money and posts performance margin with the exchange clearing houses. FCM's also employ brokers, so you might execute your trades directly through your FCM and not have an IB.
For example, Ffasttrade (one of ET's sponsors) is an IB. If you execute your trades through Ffasttrade you will probably be using Man Financial as your FCM. You could also execute directly through Man Financial or one of the many other IB's who clear through Man Financial. Whereas Velocity Futures, another ET sponsor, is an FCM, and you can execute directly through them or through one of the IB's that clear through Velocity.
Note that sometimes it is cheaper to execute through an IB than directly through the FCM. A case in point is FfastFill.
And don't confuse my use of IB with the common ET abbreviation for Interactive Brokers. Even though Interactive Brokers is often abbreviated "IB", Interactive Brokers is
not an IB, they are an FCM. Got it?

So if someone says, "IB is not an IB, it is an FCM", you'll know what they are saying.
Whoops, you deleted your post, Wercurna. Well, now that I've written my answer I'm going to post it anyway.