Scripting instructions page

[PauloIntechnica]

Hi.

In the scripting instructions page:
https://sites.google.com/a/webpagetest.o.../scripting
It is stated that "The hosted version of pagetest supports executing uploaded scripts. The scripting capabilities are a subset of the full capabilities offered by pagetest (full docs on the language here)."
And "here" is:
http://www.webperformancecentral.com/wik.../Scripting
This second link is redirecting me to the same page.
#1 - Which is wrong? The redirection or the information that the full documentation are in another URL?

The scripting tutorial page mentions the "hosted scripts" limitations.
#2 - Limitations versus what other option? What other options are there? What does it mean to be a "hosted script"?