PTT - Push To Talk

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I had this in my mind since a very long time. alomost every one of you must have used Nokia phones some or the other time. I was wondering if PTT(Push To Talk) feature in Nokia phones can really help bikers to communicate while riding, serving just like a walkie talkie. The PPT feature is available in most of the multimedia phones offered by Nokia for ex. 6600, 6681, Nokia N series etc etc Does any one know what this PPT is really all about??? Is it really possible to communicate between 2 or more nokia phones at one time using this feature??? and if yes, then it should be free (as we won't be using our mobile operator services)