We are going to study all MetaTrader functions in www.metatrader.info.
For example you can find the MT Arrays functions at:
http://www.metatrader.info/node/38
And the Global variables functions at:
http://www.metatrader.info/node/93

__________________
Hope it helps !
Coders' Guru
Senior MQL programmer:
www.xpworx.com/custom.htm