A separate help program that obscures the main program cannot do this. 單獨的幫助程序遮蓋了主程序,做不到這一點(diǎn)。
Intrusive viruses invade an existing program and actually insert a portion of themselves into the host program. 入侵型病毒侵入已有的程序,實(shí)際上是把病毒程序的一部分插入到主程序中。