Download the solution in the browser input URL

In the browser input URL download
I put some software on the server and some compression package, the client by the browser to enter the URL to download these files, how to write server-side code?
Also I want to record the number of times the file is downloaded should be how to write?
Thanked first

------Solution--------------------
Do not write, the server will directly transfer these files to the browser, if the browser is not recognized, the file will be saved to the local, that is, the download.
Also I want to record the number of times the file is downloaded should be how to write?
This will use PHP as a mediator, record the download of the relevant files, and to read the specified file.

Give you a link http://jennal.cn/2009/01/31/php%E4%B8%8B%E8%BD%BD%E6%96%87%E4%BB%B6%E7%9A%84%E5%87%BD%E6%95%B0/

