13 lines
504 B
Markdown
13 lines
504 B
Markdown
# Libraries
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in programming there is concept which named Library, Module, Package or etc, and this concept is a place which consist of some classes and grouped functions.
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this package and compiled and other programmers can only used this packages provided tools and stuffs regarding less to access it's source code. it is a BlackBox.
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in MQL Libraries compiled to files by .mqh extension, like C++, and can imports using include reserved key.
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```mq4
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#include <Trade/Trade.mqh>
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```
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see Include file ...
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