Creating/using a download manager

[nicky j]

Hello,

I am wondering how I could make a download manager for my web browser. I would like to be able to click a download link on a webpage, and have a window pop up with a progress bar, pause button, etc. That part is just GUI, so it shouldn't be crazy hard, but I'm not sure how to do the internals. I also believe (but not sure) that all modern OS's have a built in download manager, would it be possible to leverage that for downloading files from the web on my browser. The download manager should also be capable of uploads. Also a little question about computer theory: what is the difference between a download manager and a package manager? why do some OS's (like Linux) have them and others (like OS X) do not?