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copied!<p>If I understand correctly, your app has two modes. Let's call them red and blue. User opens window 1 and selects red. User then opens window 2 and selects blue. If you merely used sessions, then if the user goes back to window 1 and clicks anything, the result would be blue because the previous click was blue, even though window 1 is red.</p> <p>I suggest using mod_rewrite (or an equivalent on non-Apache servers) to modify the URL to indicate the mode.</p> <p>Incoming request for </p> <pre><code>example.com/red/yourscript ==> example.com/yourscript?mode=red example.com/blue/yourscript ==> example.com/yourscript?mode=blue </code></pre> <p>If all the links and forms on your page are relative and not absolute, the URLs should have the mode info in them.</p> <p>That is, if the page URL is</p> <pre><code>example.com/red/yourscript </code></pre> <p>then links on the page that look like this</p> <pre><code><form action="anotherscript"> </code></pre> <p>will have a URL of</p> <pre><code>example.com/red/anotherscript </code></pre> <p>Another way would be to use subdomains</p> <pre><code>red.example.com/yourscript ==> example.com/yourscript blue.example.com/yourscript ==> example.com/yourscript </code></pre> <p>You would not need mod_rewrite if you configure your server to serve both subdomains from the same real location.</p> <p>Using the subdomains would allow you to extract the mode from the http_referer field of each incoming request and you wouldn't need to add the query string. </p> <p>Lastly, add absolute links to explicitly change the mode.</p> <pre><code><a href="http://example.com/red/changemode">Click here to go to RED mode</a> <a href="http://example.com/blue/changemode">Click here to go to BLUE mode</a> </code></pre>

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