Are component parameters shared between sessions?

Hi all,

I have a question and a problem that I was unable to find in tapestry
documentation.

I have a page that has a filter component. This components basically
accepts a filter and then displays is properties. A user can modify those
properties and when it presses a button this value is set back to the
components parameter. This in returns is then propagated (since parameters
are bi-directional) back to the page that is then able to filter for
correct data.

Now my problem is that since I have

@Persist
@Property
private Filter filter

on my page and once a value from component is is returned to this property
for the user1 it is also applied to the user2.

Is this something expected? I would expect that if the value is returned
for user1 then user2 can't see this, am i wrong?

In my FilterComponent I have

@Parameter
private Filter filter;

and then when a form is submitted I do something like

filter = new Filter(selectedSections())

Reading a tapestry documentation I get that page only has one instance, so
does this mean that once I place something in the component's parameter it
is unable to determine in which session it should be place?

Thanks and let me know if you need more code