What happens to my installed CS6 Master Suite apps with CC?

Hi -

This line of questioning may be the product of a suspicious mind but - what happens to my investment of Adobe applications when I subscribe to CC?

Will they be overwritten or deactivated?

If I'm in a situation where I have no access to the Cloud, will I be able to use my installed Master Suite CS6 applications seamlessly?  What Adobe apps WOULD I be able to use if I have no connectivity?

Thanks.

JL