DPB (Database Parameter Buffer)

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DPB or Database Parameter Buffer, is a char array used to communicate parameters and their respective values to the engine when using API calls. A DPB includes a first byte with its version and a cluster of bytes for each parameter, where each cluster has one byte for the parameter type, the length of the cluster after the type and the bytes themselves that carry the information, depending on the parameter type.

Source: https://www.cvalde.net/document/glossary.htm