A rootkit is a program (or combination of several programs) designed
to take fundamental control (in Unix terms "root" access, in Windows
terms "Administrator" access) of a computer system, without
authorization by the system's owners and legitimate managers. Access
to the hardware (i.e., the reset switch) is rarely required as a
rootkit is intended to seize control of the operating system running
on the hardware. Typically, rootkits act to obscure their presence on
the system through subversion or evasion of standard operating system
security mechanisms. Often, they are also Trojans as well, thus
fooling users into believing they are safe to run on their systems.
Techniques used to accomplish this can include concealing running
processes from monitoring programs, or hiding files or system data
from the operating system.
यहाँ विस्तार से पढ़ें: http://en.wikipedia.org/wiki/Rootkit
-Nishant
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How about some patent on "(a+b)2 = a2+2ab+b2". Choose free software!
http://www.nishants.net