schema and roles

Hi,

several days ago i wrote a post but i did not get any answer, so i'm asking
again just in case of someone hasn't seen it.

in fact i would like to know what are the default schemas allowed or active
for a particular role.
usually it's public and $user, but how to get those information ?
i mean if i'm logged with the role "test_user", typing show search_path;
will show me all default schemas.
1. is there another place (in som pg_... table) where this information is
stored ?
2. if yes how can i get it ?

After that, i know that using alter user test_user .... i can add another
schema as default, but how to remove some ?
thanks a lot,

--
Alain
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Windows XP SP3
PostgreSQL 8.2.4 / MS SQL server 2005
Apache 2.2.4
PHP 5.2.4
C# 2005-2008