Gets or sets a value that indicates whether processing the message header is mandatory or optional.
Public MustOverride ReadOnly Property MustUnderstand As Boolean
If this property is true and the message receiver cannot interpret the message header, the message is not processed and an exception is thrown. If this property is false, the receiver can ignore the message header and continue processing.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.