volume representing to real volume/lot?

 
Do volume in metatrader4/mt3 representing real transaction volume (lots)in global forex market in arround the world ?? ..or 'tick volume' ??
Thanks a lot!
 
there is tick volume
 
Thanks Slawa,
Now i wanna know... is tick volume could representing real transaction volume (lots)in global forex market??
Like volume/lots in stock market?
I see volume at brokerage firm like FXDD and Interbankfx different from meta3 ormeta4 from metaquotes.net....??
where is the valid volume?
Thanks again
 
some correlation must be