general - combine command link with (hidden) value?

[stephan opitz]

first - is it possible to log all submited params in to file or output
of servers log?

second:
how i built input sides with command button is no problem...

but if  i have a commandlink, which should go to a side and has an
hidden value, from which the sides generate output :-/

                        <element renderId="2" jsfid="h:commandLink">
                                <attributes>
                                        <set name="id" value="id" />
                                        <set name="action" 
value="#{categories.showCats}" />
                                </attributes>

                                <element renderId="1" jsfid="h:inputHidden">
                                        <attributes>
                                                <set name="id" value="category_id" 
/>
                                                <set name="value" 
value="#{node.identifier}" />
                                        </attributes>
                                </element>

                                <element renderId="2" jsfid="h:outputText">
                                        <attributes>
                                                <set name="value" 
value="#{node.description}" />
                                                <set name="styleClass" 
value="nodeFolder" />
                                        </attributes>
                                </element>
                        </element>

the commandlink links to another side... the method showCats will be
called, but how i also submit the category_id and ist it usefull to
use some kind of the new functions like init() to prebuilt output data
from db for the given category_id

stephan