The IE Security dialog (tools->internet options->security->custom level) has been extended in NGWS to provide control over whether managed code is downloaded at all through the browser. This is in addition to the control that can be obtained through code access security.
Specifically, the following choices have been added to the security dialog:
Managed Controls
Enable: enables the download and hosting of managed controls
Disable: disables the download and hosting of managed controls
Prompt: prompts browser user before managed control is downloaded and run