In case you’re wondering, purchased software has official software-installation procedures. To install these pieces of software, you must be the superuser — the one who can clobber anyone’s files anywhere — by logging in as root or running su , and run a program named something like install . The install program directs you to load tapes, CD-ROMs, or disks as appropriate; reads in the programs; and then asks a bunch of configuration questions, such as "Does this system support DES-protected NFS mounts across router boundaries?" We suggest that you leave this procedure to trained professionals.