global system for mobile communications GSM global positioning system GPS gigabyte per second GBps gigabyte GB gigabit per second Gbps gigabit Gb general public license GPL general packet radio service GPRS frequently asked questions FAQ file transfer protocol FTP file allocation table FAT extensible markup language XML Encapsulated PostScript EPS domain name server DNS disc operating system DOS digital video disc DVD digital versatile disc   digital audio tape DAT compact disk rewritable CD-RW compact disk recordable CD-R compact disk CD compact disc read-only memory CD-ROM compact disc CD common gateway interface CGI central processing unit CPU