if you have two modems than you can connect to server (mediafire, depositfile) using 2 different ip addresses. For two different files to be downloaded you can differentiate it using route command in winxp, each file for each ppp connection and gaining greater combined bandwidth downloading two files simultaneously. But what about single file to download ? well route CAN’t accomodate it. Since TCP connection cannot be share over two ip addresses. we have to write proxy for each application?The proxy will open connections on all interfaces and aggregates data incoming to single boosted performance.
in case of resumable ( http/ftp) download we achieve advantage by using section discriminator for only single file download ? each section of a file is downloaded by different ppp/tcp connection.