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I have Snow Leopard OX 10 6.8, if I upgrade to Maverick what happens to all the current programs ? Do I have to reinstall all of them ?

The supported apps will appear in your Applications folder. The unsupported ones will be put in a folder like /Unsupported Applications. Also, if you have GPL apps (i.e. not installed inside /Applications) like MacPorts, you'll have to reinstall/recompile.
 
I have Snow Leopard OX 10 6.8, if I upgrade to Maverick what happens to all the current programs ? Do I have to reinstall all of them ?

After you upgrade it should leave all your apps & files exactly as they were previously. When I upgraded to Mavericks I noticed no changes to my existing apps & files - they were all still where I left them :)
 
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