Non-Existent Cascade DataHub Points

Cogent API and Utilities: Version 4.1
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# 5.3. Non-Existent Cascade DataHub Points

The Cascade DataHub, by default, creates any points that do not currently exist whenever it receives a read, write or exception request message. This allows the datahub to populate itself without having any a-priori information about the system in which it is running. On occasion, it may be useful for a task to determine whether a point exists. This may be done using the functions `DH_WriteExistingPoint`, `DH_ReadExistingPoint` and `DH_RegisterExistingPoint`. These functions will return an error if the named point does not exist when the function is called.

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