I just got a new laptop: Toshiba Satellite L6500. I know there are probably short cuts enabled on it but I have no idea what they are or how they work. I will be typing away as I am right now and all of a sudden, my entire email, comment or post will disappear. I have a feeling that I am accidentally hitting two keys to erase it but I don't know what they are or how to turn them off.

I can also supernaturally open a new tab, look at the fonts etc. behind what I'm typing and "disconnect" my keyboard so I can't type

Thanks for any and all help.