How can i share downloaded data!!!

hi everybody..
i want to a program like download accelerator...it use 2 or more simultaneous download...how can i do this....if i use multi threading...how can i share byte among threads...i mean how can i share which part of file to which thread
every replies will be helpful

Read up the HTML specifications. It's possible to send a header where you request for a specific range of bytes in the file to download. You could get the filesize through a HTTP request, then assign byte ranges to specific threads and let each download their own part into seperate buffers. Let the threads write their data in sequence to a file (so some of them will have to wait until another finishes, this should not be a big deal when you assign byte ranges efficiently).
http://www.w3.org/Protocols/rfc2616/rfc2616.html

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