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Defines an event firing function for a custom event belonging to the dispatch ID specified by dispid.
The vtsParams argument is a space-separated list of values from the VTS_ constants. One or more of these values separated by spaces, not commas, specifies the function's parameter list. For example:
specifies a list containing a 32-bit integer representing an RGB color value, followed by a pointer to the IFontDisp interface of an OLE font object.
For a list of the VTS_ constants, see EVENT_CUSTOM.