A code page:

 
<% 
Response. Cookies (" aaa ")="123456" 'value is random number 
The Response. Cookies (" aaa "). The Expires=DateAdd (" n ", 1, Now ()) 
% & gt; 

When the page B judgment Cookies after 1 minute expired aaa is empty output access illegal

 & lt; % 
If the request. Cookies (" aaa ")="" then 
Response. Write (" access to illegal ") 
End the If 
% & gt; 

I just set up above the Cookies expiration time will not be able to output & lt; %=request. The Cookies (" aaa ") % & gt;

Trouble master to help find out what is going on,

My idea is that on page for page A is front end message form, page B was received form page, so the page B banned direct access, there is no better way?