MarketInfo()

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> if MarketInfo(symX) called after ArrayCopySeries(symX) will MarketInfo(symX) always return with ok value when asking for ask,bid,point,digits of symX ?

or should GetLastError() be called after each MarketInfo() call ?

> if iBars(symX) called after ArrayCopySeries(symX) will iBars(symX) always return with ok value or should GetLastError() be called after iBars() call ?

asking because mql help not talk about errors for MarketInfo(), iBars()

or maybe always return ok value because if have to, server request made to get data?