This key is used to store dynamic Registry data. The Windows 95 Registry supports both static data (which is stored on disk in the Registry) and dynamic data (which changes frequently, such as performance statistics). This dynamic data area is the mechanism that allows VxDs to provide real-time data to Win32 applications that can run remotely as well as locally. It also allows the system monitor to provide performance statistics on remote Windows 95 systems. VxDs are not limited to performance data. They can provide any data they want to pass from Ring 0 to Ring 3 efficiently without hogging the CPU. The Registry supports dynamic data by storing a pointer to a function that returns a value (or many values). When a Registry call queries values associated with a dynamic key, that function is called to return the desired value(s).
NOTE: Dynamic keys have been introduced in Microsoft Windows 95 to handle dynamic Registry data. They are supported only in Windows 95.