Apple Keynote '09 - Manual (Page 39)

Chapter 2 Creating, Opening, and Saving a Keynote Presentation 39
Closing a Document Without Quitting Keynote
When you’ve finished working with a document, you can close it without
quitting Keynote.
Here are ways to close documents and keep the application open:
To close the active document, choose File > Close or click the close button in the
m
upper-left corner of the document window.
To close all open Keynote documents, choose File > Close All or press the Option key
m
and click the active document’s close button.
If you’ve made changes since you last saved the document, Keynote prompts you
to save.