Preventing connection to open wireless networks

[R.L. Grigg]

On Aug 15, 2007, at 1:37 PM, Karl Kuehn wrote:

> On Aug 15, 2007, at 3:08 PM, R.L. Grigg wrote:
>
>> Is there a way on OSX 10.4.10 to disable it from connecting to  
>> open wireless networks? Ie to make it only able to connect to WPA  
>> networks? System Prefs doesnt seem to have that option.
>
> 	It is a two step process:
>
> System Preferences->Network->Show:Airport->Airport (tab)
> 	By default, join: Preferred Networks (once you have them in there)
>
> Then click on "Options..." and set "If no recent networks are  
> found:" to "Keep looking for preferred networks".

On my system it has only the option: "Keep looking for recent  
networks". Does "recent" restrict itself to the set of preferred  
networks?
Russ