In Apache httpd.conf file I can set the DocumentRoot value. After setting this, if I view "localhost" in a browser, I can see the folders and files this given folder contains. I cannot "speak" PHP language well yet but I assume that all PHP activities in connection with files and folders are limited to the scope of localhost, so if I handle files with PHP they must be in the folder set as DocumentRoot (or in subfolders of it).
How can I set localhost's scope to a wider range, especially to other drives? My goal is to be able to handle files with PHP on my whole computer (it's a "locahost-only" project so it's not a must to be able to use it on "real" servers).