[Skypeenglish] How conerences are handled in Skype 4.0 Beta

[Jeffrey Shockley, Windows Desktop Edition]

Hello all,
Could someone please tell me how conferences are handled in Skype 4.0 Beta?
And, how to do thinks like add people toa conerence when someone leaves and 
wantes to be readded, and how it is preensented and how to remove people and 
stufff?
Thanks, and hope this isn't too many questins,
Jeffrey