Maximum Concurrent
Specify the maximum number of concurrent instances of this task you want TaskMan to allow.
The default value is 20. Valid values are positive integers.
A value of -1 means any number of concurrent instances of this task are allowed to run, up to other limits imposed on all tasks.
Note: A value of zero (0) should not be used, as it disables the task
completely.
For more information, see About Maximum Concurrent Tasks.