Start a new activity.
@param inttimeout The timeout associated with the activity. If the activity has not been terminated by the time this period elapses, then it will automatically be terminated.
@exception WrongStateException Thrown if the currently associated activity is in a state that does not allow a new activity to be enlisted as a child.
@exception InvalidTimeoutException Thrown if the specified timeout is invalid within the current working environment.
@exception SystemException Thrown in any other situation.
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