How to use Add-Ins Components in 1C (like Native API DLLs, COM...)

Now, my 1C application need to interact with external device.
I already haved one DLL written in C language for support interacting (read/write data) with external device. I temporary called this DLL is "ABC.dll". Suppose that this DLL exposed two interfaces as below:
+ Read();
+ Write();
So now, my 1C application need to use ABC.dll for:
+ Read data from external device for storing to 1C application
+ Write data that is stored in 1C application to external device

But, I does not know how to do this in 1C !
+ How to embed ABC.dll to my 1C application ?
+ Should I embed ABC.dll to my 1C application when it's starting or embed ABC.dll to sub-components of my 1C application (like a document form)
+ After embed ABC.dll to my 1C application, how could I use the Read(), Write() interface (that ABC.dll public) in my 1C application ?

Plz help,
Thanks & Best regards,
Son

See Creating External Components Manual.

Yeah ! I have downloaded this document
I will read and try to solve my problem
Many thanks for your help

Best regards,
Le Anh Son