But because it was installed secretly, no one knew what had happened to their computer.

We had landed on Voga 4 with the help of a matter transmitter secretly installed there.

After he moved out of the house, according to the documents, he secretly installed a video camera, apparently trying to catch her with a lover.

He slotted the portable semaphore arms on to the post he'd secretly installed weeks ago.

MI5 agents secretly installed video and audio recording equipment inside the apartment, two senior British officials said.

A person briefed on the matter said that software had been installed secretly on the network to facilitate the theft.

The Temple of Mars was built, all of the equipment secretly installed, and so has it been down through the ages.

Video and audio devices were installed secretly by customs officials both at the termini and in the tunnel itself.

"But it violates federal law to secretly install software that forces consumers to get pop-ups that disrupt their computer use."

But there are also rogue ActiveX controls that secretly install software on your computer or do other malicious deeds.