Yes, you can share your Keynote presentation in full screen mode during a GatherPlace meeting.
However, you must use Keynote 3.0 or higher and set one of the preferences in the Keynote program.
To enable GatherPlace to capture Macintosh Keynote presentations in full screen mode, please follow the steps below.

1. Launch Keynote and select Preferences from the Keynote menu.
   
   
   
   
   
   
2. Select the Slideshow icon on the Slideshow Preferences dialog and turn on the option titled 'Allow Expose, Dashboard, and others to use screen.'
   
   

Note:

• Earlier versions of Keynote do not have this option so you must use version 3.0 or later to share in full screen mode.
  
• Using earlier versions of Keynote, or versions without this option enabled, will share the first slide only in full screen mode. Any subsequent slides will not appear on the guest views.
  
• If full screen mode is not necessary, earlier versions of Keynote can be used.