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<td><font face="Times">Creates and returns the token for a new Interactive RenderMan context with the name <i>contextName</i>.&nbsp; The new context is entered into the Interactive RenderMan contexts dictionary and made the current context.&nbsp; If you pass a null pointer as <i>contextName</i>, a unique string is created for the context name.&nbsp; If a new context cannot be created for any reason, RI_NULL is returned and the current context remains as before.<