A Black Trojan Horse is capable of opening a back door and keeping it open for viruses to be transported in.
Think of it this way: Your computer has a front door that is being protected by your Antivirus. Your computer also has a backdoor that has some protection, but not alot, So if a program is let through your computer (front door), it could have a virus which navigates its way to the computer's back door, and then it can let viruses in.
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