Clarification Re: "Close[ ]" Values

[Huck Finn]

When you use the "Close[ ]" operator with a zero (ie current bar) in the brackets what does that mean if you are only partially through the current H1, M15, M5, or M1 period?

Does it mean: A) the value of the last tick prior to the current tick?

or B) something else?

Likewise, does High[0], mean: A) the highest value encountered thus far in the current period?

or B) something else?

[Ray]

Close[0] = current Bid

High[0] = high of the current bar (may be different on different timeframes)

[Huck Finn]

phy:

Close[0] = current Bid

High[0] = high of the current bar (may be different on different timeframes)

phy, thanks for that clarification?