Download managers

I have read in wikipedia that download managers use what is called offset in downloading files meaning that the open multiple connection channel and download the file in parallel .so on of its streams may request the file starting from a specific byte rather than the beginning of the file and the site says that this is supported in both FTP and HTTP .Now could someone please tell me how i can request a file from a specific byte .(All i know about downloading files is that u open a connection and get an outputStream object then read the contents and then do whatever you wanna do but that is the whole file.

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request the file starting from a specific byte

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Have never seem that in a general purpose server. Do you have a reference to where that was stated?
Do you have the syntax for it?

I do have areference but my posts haven't exceeded 20 yet so i can't post a url but you can write httprevealer in google then it will give you the site (the first link) in the main page there is a hyperlink that says How do Download Managers accelerate file downloads? you can found it there .You will notice in the miidle of the page it says(Range: bytes=1413878-) this is sent to the server to tell it to return the file from that particular byte.

thanks for that.

Not at all ,In fact thanks a million for your valuable replies, you're very knowledgeable .