Warning: This property is deprecated. Deprecated components of Microsoft DirectX 9.0 for Managed Code are considered obsolete. While these components are still supported in this release of DirectX 9.0 for Managed Code, they may be removed in the future. When writing new applications, you should avoid using these deprecated components. When modifying existing applications, you are strongly encouraged to remove any dependency on these components.
Value indicating how often you want to receive DVMSGID_OUTPUTLEVEL and DVMSGID_INPUTLEVEL (if session is full duplex) messages. If this value is set to 0, these messages are disabled. The value specifies the number of milliseconds between these messages. DVNOTIFYPERIOD_MINPERIOD specifies the minimum period between messages that is allowed. Deprecated.