Programs do this so that you can basically build or add functionality to a program without having to have every single little detail within one program. It makes programming the base program easier if it can go get parts or information it needs from another program, or a library (as in DLL files), or sometimes even a web server.

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ok, I try to write an EA,
expert uses iCustom to get some values from Indicator1, Indicator1 calls Indicator2 for some cals
all objects are in standart MT4 folder bu got error like
Indicator1 : Error! C:\Program Files (x86)\MetaTrader\experts\indicators\Indicator1.ex4 cannot be found.
why it goes to Program Files (x86) and how to change the settings, I have mq4 files