Daniele
First, I believe that this is the wrong group to post this in. I think that
microsoft.public.sqlserver.fulltext would have been a better choice...
To answer your question you can use the proc sp_fulltext_table to mark a
table for fulltext indexing. The specific implementation can be found in the
BOL. Be aware that this is a very broad question. You must have Full Text
indexing set up on your server for this to work. There is more to the full
text search than just marking the table. I would suggest that you consult
the BOL to make sure that you understand everything that is involved and then
use the newsgroup above for any specific questions.
I hope this helps.