You are generally limited to your deposit unless you sign a person guarantee, which would not be typical. I'm not sure if they will allow a entity as a member. You have to register with them and U4.
NO! These are not customer accounts. You will not be their customer. When you join a prop firm of this kind, you are a member of a broker dealer and your capital joins with their capital. When this happens, the SEC requires your capital stay in the firm for at least 1 year. They give you an account to trade in, to monitor P & L. However, you are trading firm capital with your money as first loss. They make most of their money by charging a higher commission that the Prime Broker charges them. They receive a percentage of your profits too for providing leverage. Typical your split is 80% to 99%. They mostly care about volume, as that is where they make most of their money. Some firms charge for training too.

Most of these JBO/prop firms focus on equity day traders. Some allow options but that requires more capital and has more risk. I'm not familiar with ones that trade futures or FX, as you can get a lot of leverage in futures and FX with small accounts, but you can't get that with equity smalls accounts.So if they run into financial problems you could go down with them? IE : Refco FX.
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rg12,
BTW, these are USA regulatory rules. I have no idea how foreign prop firms like this are regulated when operated outside the US.