In an instant the lights went out and the room was silent.

The first syllable in "instant" is stressed: IN-stant.

There are quite a few toxins that can cause instant death such as gephyrotoxin. Histrionicotoxin is another very toxic chemical.

yes it can be used like that but there are some instant messaging that you do not need to enter in a chat room to be able to use. Like Yahoo Messenger. you just need to have the Yahoo ID of a person and you can use the instant messenger. even in Facebook there's a feature where in you can instant message a friend that is online at the moment you are online.

Most of the instant messaging services, MSN, AIM, Yahoo, etc., will work for Macs and Windows.