Authenticity Token!!!!!!!!!

#Answer_controller   def index Hi! I have next problem.. Please help me understand how token works?? I need create each form for each user.. i mean, one user can see my form only once! (unique session)...

   @answers=Hash.new     if request.post?       questions = Question.find(:all,:conditions=>"enabled=1")   questions.each do |question|             if params["answer_"+question.id.to_s]      @answers[question.id]=params["answer_"+question.id.to_s]          if ! Answer.create(:question_id=>question.id,:text=>params["answer_"+question.id.to_s])       flash[:error]="Can`t create answer!"      end             end   end   if !flash[:error]           redirect_to :action=>"pass"            return false   end      end

     @questions = Question.find(:all,:conditions=>"enabled=1")

  end

#view answer.html.erb <center>

<h1>Survey SIMPLE</h1>

<% form_tag do %> <table>   <% @questions.each do |question| %>   <tr style="vertical-align:top; text-align:left">     <th><%= question.text %></th>     <td><%= text_area_tag "answer_#{question.id}",@answers[question.id], :cols=>"100", :rows=>"3" %></td>   </tr>   <% end %> </table>   <%= submit_tag 'Pass survey' %> <% end %>

</center>