[ZPT] accessing user agent in ZPT

[zope]

Hi

I am new to Zope & studying ZPT. I want to access the user agent to dynamically build a link depending upon the user agent.

I found this which works:

The user agent  

Is there a request path expression like the following that works?

The user agent  

Also is there a list of all valid request path expressions? I think it is not in the Zope book or searches (I've checked).

Regards

Michael.
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