Yes. However, Keynote documents can be saved in various formats for viewing on other operating systems. Programs similar to Keynote for the PC include Microsoft Powerpoint and OpenOffice.org Impress.
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Apple has a program called Keynote which is similar to PowerPoint on a PC. Keynote files are the presentations created with Keynote.
Firewall, and password protection. Security software is not needed for the Mac. There has never been a virus infect the Mac OSx. You can however be infected with spyware just like any computer. Use common sense install a program such as WOT. Wot will warn you of malicious websites.
I've never used a Mac, but I've heard that people who use them like them. I think Mac has about a 10% share of the computer market. Mac makes it's own software and hardware. I guess there can be compatability issues when sharing files from Mac to PC. With PC, there are thousands of software makers who make programs that are compatible with Microsoft Windows operating system so there is much more available/ compatible.
fannie mae= 1938- Democratic President Roosevelt freddie mac= 1970- Republican President Nixon
Mac Guttenberg, he said it on twitter once