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Wait
The wait task waits on one or more tasks before continuing. This can be helpful when separate sequences need to be synchronized.
In this example, the wait task waits for Build_Linux to complete before continuing on to Package_Windows. This allows both Build_Linux and Build_Windows to execute in parallel but prevents Package_Windows from executing before the linux build completes. Presumablely the linux build performs tasks that need to complete before the Package_Windows step can execute.
The wait task's configuration from the example above is shown below.

The conditions can be added, edited or deleted by the buttons below the table. The condition used in the example is shown below.

All of the conditions in the table must be satsified before the task succeeds. If any of the tasks complete or a sequence stops before a tasks that is being waited on can run, the wait task will fail.