This variable is used for creating rows in the smRunTable.
The value of this variable is a currently unused value
for smRunIndex, which can be written into the smLaunchStart
object associated with this row to launch a script.
The value returned when reading this variable must be unique
for the smLaunchOwner and smLaunchName associated with this
row. Subsequent attempts to read this variable must return
different values.
This variable will return the special value 0 if no new rows
can be created.
Note that the data type and the range of this object must be
consistent with the definition of smRunIndex.