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"can anyone tell me how it works?"
The XT_Temas module do not set cookie. In the 'xoops_users' table, you have a field called "theme". When you login, XOOPS reads the content of this field and set the theme as default for this user. The module XT_Temas simply change this value in the users table for the theme chosen for the user.
XT_Temas has only one block and nothing more than this.
You must use this block in the place of the "themes block" standard of xoops.
If you have any more questions about any brazillian module, you can post (in english too) in
http://www.xoops.net.brSorry for my bad english... i need a good course of English...