Guys i'm abit confused with the following functions:

1.Sell at Market
2.Buy at Market
3.Close Position

Say GBP/USD my base currency is USD, how does Sell at Market works, I though you need to buy GPB (a.k.a selling USD) 1st then you can sell? Sorry I only have very basic money changer knowledge. I was told you can either sell or buy & make profit out of it in any new action.

I tried to google but came out with Forex program manuals which doesn't explain in detail.

Also seems Close position just let everything go, what is the difference when I open an action Buy at market then in the same action choose Sell at market compared to "Close Position"?

Maybe I'm not clear about the Buy/Sell @ market function.

I mean i'm assuming i'm using USD as base current to trade

So I understand i can buy GBP using USD, so untung when GBP goes up.

what i cannot understand is why i'm allowed to Sell GBP for USD when i don't have any GBP so untung when GBP drops.

I'm testing Hotforex i'm not sure how reliable the system is but it even allows me to trade GBP/JYP, my question is how as the currency i'm using is USD? Am i playing with the market based on market rates or am i playing with the trader based on market rates?