Skype for Mac OS X
Online status
Your online status is shown in the status bar of Skype (located at the top of the Skype window). You can change your online status by clicking on the status icon or by selecting “Change Status” from the “Account” menu.

Online status can be any of the following:
Online – this is the default status when you have logged in to Skype.
Skype Me!™ – this status tells users that you are interested in communicating. Skype Me! mode disables your privacy settings and allows anyone to contact you, whether you have authorized them or not.
Away – this status is activated if you are logged on to Skype, but have not used your computer for a while.
Not available – this status is activated if you are logged on to Skype, but have not used your computer for an extended period of time.
Do Not Disturb – this status is useful when you are busy and do not want to be bothered. Calls and chat alerts will not be displayed in this mode, however you can check for chats and calls in the events panel at any time.
Invisible – this status lets you use Skype as usual for chatting and calling but means that you will appear as offline to all your contacts.
Offline – this means the user is not currently logged in to Skype, or has chosen to appear invisible or offline.