a couple questions about cross pairs

Hi, I've so confused with this simple tasks and I will be very glad when anybody try to answer...

Imho "physically" there's no cross pairs and when I try to trade E/Y, so broker will open E/U and U/Y.

1. Is this idea correct? If it isn't, so I have to confess to I'm totally lost ;-)

but let's say, that I have truth.. so next:
2. value of E/Y should be E/U*U/Y, but when I make a diff between broker quitation of E/Y and the result of E/U*U/Y, so I won't get zero.. There is a 1-5pips deviation. Why????

3. When I open E/Y, why broker will block me same margin as "normal" pair like E/U.. based on my idea it should be final margin = E/U margin + U/Y margin

4. and finally most strange thing: Why traders use TA on cross pairs? Quotation should be only "inform only" without any behavioral aspects like 123, Rh, ma cross, ... So what's the point?

Maybe I have a stupid, silly questions, but be patience.. And by, the way.. happy new year

Buying EUR/JPY means that you are buying EUR and selling JPY and vice versa.

Oh, thanks.. but market doesn't work that way, you can't simply bring "your" Euros to a parket(which doesn't exist) and buy some Yens. But it sounds nice :-)

As I said before.. when you want to go long with E/Y, you have to buy two majors pair: E/U and U/Y...

E/U means [buy E / sell U]
U/Y meand [buy U / sell Y]

as you can see buy U and sell U will be satisfied, and the rest of both pairs will create [buy E / sell Y].. ergo E/Y

Are you sure? I don't mean it as an offense.. I only want to know correct answer, because it is so important for me.. It should be a part of basic knowledge of each trader. So can you describe it a little bit further?

That's right. Just got that out of my big head. Sorry.

This only happens if you have USD in your account, if for example you have EUR you'll do it straight forward.

As far as I understand it, all crosses with USD against the GBP, EUR, JPY , CAD, AUD are the major pairs and all other crosses without USD in them are "synthetic" pairs, ie. created like you say from the major pairings.

It seems that the USD is still the reserve currency of the world, as even Gold & Oil is quoted with USD.