:   '''[event] add''' ''<<virtual>> sequence ?sequence ...?''

Associates the virtual event ''virtual'' with the physical event sequence(s) given by the ''sequence'' arguments, so that the virtual event will trigger whenever any one of the ''sequences'' occurs. ''Virtual'' may be any string value and ''sequence'' may have any of the values allowed for the ''sequence'' argument to the '''[bind]''' command. If ''virtual'' is already defined, the new physical event sequences add to the existing sequences for the event.

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**See also**
   * [event delete]
   * [event info]
   * [bind]
   * [virtual event]
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