DLL imports, what is it that you are allowing?

[david]

Hoping someone might explain in basic terminology, what it is you are actually giving metatrader permission to do, when you click on "allow DLL imports".

I checked the help topics and see plenty of references to DLL, but not the basic explanation I had hoped for

thanks in advance!!

[Simon Gniadkowski]

This tells you: https://docs.mql4.com/runtime/imports

Basically you are allowing the use of functions contained within a DLL to be used when called.

[Haris H]

Most of the EA/Indicators do not need a DLL. Although programming in MQL is fairly limiting. It suffices for 99% of EA/Indicators.

DLL programming for metatrader is only appropriate whenever MQL does not offer a capability that EA/Indicator needs. 

So you're allowing to use some more functions that contained in DLL.