Whenawebpageisaccessed,theservercheckstheextensiontoknowhowtohandlethepage.Generallyspeakingifitseesa.htmor.htmlfile,itsendsitrighttothebrowserbecauseitdoesn'thaveanythingtoprocessontheserver.Ifitseesa.phpextension(or.shtml,or.asp,etc),itknowsthatitneedstoexecutetheappropriatecodebeforepassingitalongtothebrowser.Hereistheproblem:Youfindtheperfectscript,andyouwanttorunitonyoursite,butyouneedto...