Active Directory Computer/Browse List Integration
Hyena can integrate the information from the Windows browse list with any Active Directory computer display. This allows Hyena to "gray out" computers in any computer listing, including OU displays, that are not found on the active browse list. This feature is automatically enabled for Windows NT domains.
Hyena will only refresh the browse list every 15 minutes for a given domain, so the performance impact of turning this feature on should be minimal.
To enable this feature, go into Tools->Settings->View, and turn on the "Integrate browse list with Active Directory computer listing" option.
After enabling, expand any OU that contains any computers (or the Computers object), and any potentially offline computers will be grayed out.