Java SE Runtime Env -vs- J2SE Runtime Env -vs- Java 6 update 11

I'm brand new to Java, must have the Java Runtime Environment installed, but do not understand if some are newer versions of the same thing or separate programs entirely.
I currently have installed:
J2SE Runtime Environment 5.0 Update 11
Java 6 Update 11
Java 6 Update 5
Java 6 Update 7
Java SE Runtime Environment 6 Update 1
Is there Java for programming and the JRE for running programs? What's the latest version of these things? What does SE stand for? What is J2SE?
Where oh where can I get this sorted out online?
Thanks very much!
schubash

I too am struggling with the new updates to Java 6. crashes, lagging and unstable webpages. I have submitted one of the numerous bug reports and hope that helps but in the mean time updated to 11 from 10 that was probably stupid because 10 gave me the problem

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