[client_postparam] retrieves the named parameter. Useful for addressing params where multiples may exist.

The first parameter is the name of the parameter, the second may either be the keyword "-count" , an integer which will return the value of the parameter at that index.

[client_postparam] can also be used with just the one parameter and will then output a line-break delimited string of each postparam.

This method is deprecated in favor of [web_request->postParam].