I came across a post on LD4All by secretsquirel that can be named OILD(Object Initiated Lucid Dream).Basically, secretsquirrel holds a pencil in his hand, concentrates on it, and if it's not there(unless you dropped it) your dreaming. Concentration is the main thing. I believe I heard something like this before on here

Also, here's a website on HI including a video on it:

http://www.lucidcrossroads.co.uk/WILD.htm