How do u cache a web page in ASP.NET?

<%@ outputcache duration=”60” varybyparam=”none”>

What is difference between following statements:

1. <%@ outputcache duration=”60” varybyparam=”none”>
2. <%@ outputcache duration=”60” varybyparam=”*”>
3. <%@ outputcache duration=”60” varybyparam=”name”>

Statement 1 caches only one version of the page irrespective of query-string parameters.
Statement 2 caches multiple versions of same page I any of query-string parameter varies.
Statement 3 caches multiple versions of the page for different values of parameter xyz.