change content type by irule

1) Are these truly global? IE: Can I access them from different VIPS/rules/etc? (vs. multiple iterations of the same irule)

 

2) Is there a way to release a declared variable?

 

3) I haven't make much use of variables to date. (Just simple strings and small integers) Where is the best place to find out more about variable types and ranges?

 

4) Also would the TCL docs be the best place to find out about variable operations?

 

 

Thanks,

 

Brian