MetaQuotes is extremely poor in term of support as I mentioned in
Barriers that make MetaTrader unattractive to big brokers thread. Why their support is poor? Because most of their staffs are Russians who are mostly English illiteracy. I noticed a few staffs who can can speak and write English well in their MT4 forum last few months, but now they might have been fired already--they're just gone from the forum.
Back to the point, there is a very good tutorial on MQ4/MQH language at
http://www.metaquotes.net/experts/mql4. I'll be right back with the mql references.