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3270 emulators are the major gateways through which viruses jump from PCs to mainframes. Antiviral Tools: Hardware The use of write-protect tabs is very important in limiting viral spread, and is one of the easiest things you can do. You have most likely bought a box of new, blank disks. In boxes of 51f4inch disks is a pack of labels and one of small peel-off-stick-on tabs, probably black or silver. On one side of each disk is a small notch called the write-protect notch. Placing one of the small tabs over each notch, bending it so it sticks to both sides of the disk and completely covers the hole, prevents the computer from writing (recording) to the disk.

Using other people's disks and programs, and letting them use yours. • Trading computer programs with strangers, or with people who trade frequently. • Running a computer program if you're unsure of the following: its origin; the number of times it has been copied; if it has been altered; or what generation copy of the original this one might be. • Executing any new computer program for the first time without first making backup copies of every program and data file on your computer. • Calling another computer using a telephone modemespecially a computer of the same type as your own.

This recommendation is extremely important. Most of the boot sector infector viruses can only infect your system if you boot from an infected floppy disk. Booting from borrowed, unknown or multiple disks greatly increases the opportunity for infection. • One and only one boot disk should be assigned to each and every floppy based PC (systems without a fixed disk), and 42 Fighting Viroses and Practicing Safe Computing that disk should be clearly labeled as the boot disk for that system. • If you have a system with a fixed disk, never boot from a floppy drive.

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