Those instructions are for ADHOC network - which no most devices wont see unless you tell them too.. Its not the normal infrastructure type of network that AP would be.
As to built in software? What are you talking about - there is no built into the OS wireless hotspot software.. Now depending on your wireless card you could have some software included from the maker of the card or the OEM.. Like wifi dashboard from intel
So details of your wireless card and what type of connection your trying to share - be it another wireless network, a cell connection, wired connection, etc.
I don't see a reason for this unless your laptop has a cell or say a wifi max connection so you could say leverage that connection for you with other portable devices, ipads, cell phones, ipods, etc..
if your in your home and your trying to share a wired connection - GO BUY a $20 wireless router and set it up as AP. I carry a old FON router that I hacked and put dd-wrt on for this purpose, say hotel or something that only has wired access.
But sure we can help you - but we need some DETAILS to work with.. But again those instructions at life hacker are for ad-hoc network, and unless you set your other devices to connect to adhoc they most likely will not see that network.