Forex

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Has anyone of you any experience tranding with Forex.I opened practicing account. Generaly i made prety good dollar $ and I wanted to understand some things. Is metatrader4 part of forex or different system ? if it is part of forex than why i can not use my forex user to log on it ? If i open standart account with 2500$ and minimums trading amount is 100000 - it mean that every time i trade they give me aditional 90000 $ ? And what is diference between minimal acount (500$/ min trade amount 10000$) except the amount of needed money ? Tried to search answers for those questions but didn't find.