What is the difference between CopyTickVolume() and CopyRealVolume()?

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Help for these two functions is not very helpful:

CopyRealVolume():  The function gets into volume_array the history data of trade volumes for the selected symbol-period pair in the specified quantity.
CopyTickVolume(): The function gets into volume_array the history data of tick volumes for the selected symbol-period pair in the specified quantity.

 

What is "trade volume" and what is "tick volume"? 

 
tick volume is the count of ticks in the Bar, real volume is (supposed to be) the amount of traded lots by all the brokers clients collectively, during that bar.
 
SDC:
  ... all the brokers...

your broker
 
qjol:

your broker

I don't think there is a MT4 broker providing these data. Please report it if otherwise.
 
I tried with three brokers today, and none provides volume data.
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