Mirror Twin - Some 25% of identical twins are mirror twins. They have mirror image finger prints, one is left-handed and other is right-handed, and their hair spirals in opposite directions.

Conjoined Twin - Commonly called Siamese twins, they are monoamniotic monochrionic twins who never completely separate. Thus, when they are born they share some part of their body. Often their hips or shoulders, and more rarely their heads, are connected. The majority of conjoined twins are mirror twins. Several successful surgical separations have been performed, allowing twins to live normal lives.

Fraternal Twin - Far more common are fraternal twins, who come from two different eggs fertilized by two different sperm cells. They share 50% of their DNA just as other siblings born at different times do.

Twins of Two - When two separate eggs are fertilized by two different men, twins of two are conceived. The children are genetically half-siblings and share just 25% of their DNA.

One hundred years ago, average parents of twins would have had to guess whether they were identical or fraternal. Nowadays, in addition to sophisticated medical equipment available, parents can have DNA tests done to determine what type of twins their children are.

c) Educate and train anyone who uses your computer(s) network. Many times an infection is invited by careless users who download infected email, visit infected sites, or bring infected machines (laptop's, pda's) into a network from outside.

d) Patch and update, patch and update, patch and update (redundant, oh yeah). Yes it's a pain, and it requires time to do and verify that it's actually patched and updated. However it's definitely simpler and cheaper than trying to fix an infestation, or explain to everyone why network is down or their computers won't work because a worm is eating through everything they have worked hard to save and protect.

e) Make sure up-to-date anti-virus software is on every machine, everything connected to Internet. Anti-virus packages aid in protection and detection against worms.

f) Establish security rules for your network and educate everyone who touches network. They must be enforced, daily.

g) Frequently check your network for vulnerabilities. Visit vulnerability website's, take advantage of free scanning tools on Internet to test your machines. New vulnerabilities and new exploits are released constantly, and you can't protect against what you have no idea what is coming your way.

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Daviyd Peterson: 10-year consultant, instructor, trainer Helps african american homeschools bridge the digital divide by becoming computer homeschools. Free article on "Computer Homeschooling" and other related articles http://www.homeschoolwireless.com/homeschoolwireless.htm