I have use for a while of an HP Envy 17 laptop. When I'll be using it away in a place where physical security may not be the best, I want to be able to lock the laptop to some immovable stationary object so that it's secure and I won't be worrying about it. The manual, such as it is, shows a security cable slot. But it doesn't say anything about the type of slot nor the type of lock that would fit. I tried to find a lock for it at a computer store but I was told there isn't a standard for these locks so the salesman couldn't tell me what to get. Is anyone familiar with this laptop's lock slot and which lock would fit in it?