(AP) -- Apple is inviting media to its Cupertino, Calif., headquarters for a Macintosh computer-related event on Oct. 20.

Apple Inc. is known for its secrecy about upcoming products. The invitation sent Wednesday offers no concrete details about the products to be announced. However, it does show an image of Apple's logo opening like a door to reveal a glimpse of a lion.

That's a clue that Apple plans to introduce a new version of Mac OS X, the software that runs on the company's desktop and laptop computers. Apple calls its operating system updates by names of large cats. The most up-to-date version is . Previous versions include Leopard, Tiger and Panther.

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