Microsoft ISA/TMG Agenthttp://www.websense.com/content/support/library/deployctr/v76/dic_ds_isa_agt.aspx
        <h2>Deployment and Installation Center </h2>
        <h3>Microsoft ISA/TMG agent</h3>
        The ISA/TMG agent receives all Web connections from a Microsoft ISA Server or Forefront TMG network and forwards them to the Data Security policy engine. It then receives the analyzed information back from the policy engine and forwards it to the recipients on the Web.
        <p>Microsoft ISA 2004 and 2006 are supported on the following operating system environments: </p>
        <ul>
            <li>Windows Server 2003 (32-bit) </li>
            <li>Standard or Enterprise </li>
            <li>Standard or Enterprise R2 </li>
            <li>Standard or Enterprise R2 SP2 </li>
            <li>Windows Server 2003 (64-bit) </li>
            <li>Standard or Enterprise R2</li>
        </ul>
        Forefront TMG is also supported, on Windows Server 2008 R2 platforms (64-bit). Note that Forefront TMG supports analysis of HTTPS traffic as well as HTTP.
        <p>Click <b>View Complete Document</b> for more. </p>