Espionage Program That Invades a Machine
This page is the CodyCross answer for the clue below from Train Travel, Group 709, Puzzle 3 (Strangers on a Train).
Question is: Espionage Program That Invades a Machine
and the answer is: SPYWARE
Word Meaning:
SPYWARE — (Internet) Programs that surreptitiously monitor and report the actions of a computer user.
Definitions from Wiktionary.