高手说下这段代码的意思?

    <httpHandlers>
      <add path="file.axd" verb="*" type="ptw.FileManager.Web.HttpHandlers.FileHandler"
        validate="false" />
      <add path="Reserved.ReportViewerWebControl.axd" verb="*" type="Microsoft.Reporting.WebForms.HttpHandler, Microsoft.ReportViewer.WebForms, Version=8.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
        validate="false" />
     
    </httpHandlers>

<httpHandlers>
<remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="*" path="*_AppService.axd" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" validate="false"/>
      <add verb="*" path="admin/adminfile/*.aspx" type="NewsUI.SessionHandler"/>
</httpHandlers> --------------------编程问答-------------------- 不是高手，稍微了解一些，
应该是web访问某些特定后缀名文件时，会做一些额外的处理，类似于过滤器之类的东西

补充：.NET技术 ,  C#