Hi Evert,
 > A trojan is a virus that disguises itself to avoid detection,
Wrong a trojan does not spread so you can't call it a virus.
 > it can do a lot of dammage since most virus scanners can't detect them
 > very  well.
That is because the trojans are not viruses there are other ways to test 
suspect programs such as CHK4BOMB or similar.
Regards, Malcolm.
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