wxWidgets defines a special identifier value wxID_ANY which is used in the following two situations:

Another standard special identifier value is wxID_NONE: this is a value which is not matched by any other id.

wxWidgets also defines a few standard command identifiers which may be used by the user code and also are sometimes used by wxWidgets itself. These reserved identifiers are all in the range between wxID_LOWEST and wxID_HIGHEST and, accordingly, the user code should avoid defining its own constants in this range (e.g. by using wxNewId()).

Refer to wxStockID enumeration values for the reference of these IDs.

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