Description says "there are special macro constant, values of which are set at the Metatrdaer of compilation" and "An absolute path to the file that is currently being compiled", but in reality its totally not a constant set during compilation; it indeed changes when expert is attached to chart according to current EA location.
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And sorry if I sounded like a smart ass, I was in a hurry: The use of included files is more preferable than the use of libraries because of additional burden occurring at calling library functions. Programs written in MetaQuotes Language 4 have different features and purposes: An Expert Advisor starts to run when an event happens that can be handled by it: The brief guide contains functions, operations, reserved words, and other language constructions divided into categories, and allows finding the description of every used element of the language. Besides, using MQL4 you can create your own technical indicators custom indicatorsscripts and libraries.
Traders can also simply click and drag the item onto a chart.
Beginner's Guide To MetaTrader 4: Advanced Features
This will open the programming environment. Thinking about it some more, if you move the MQx file to a different directory, it gets re-compiled, so the description is technically correct As far as I'm aware, there's technically 3 locations to write to unless someone has more info??? There are three folders with subfolders that can contain working files: Custom Indicator is a technical indicator written independently in addition to those already integrated into the client terminal.