Each function listed below returns error handling information or performs a task that relates to error handling.

DbiGetErrorContext:
After receiving an error code back from a call, enables the client to probe BDE for more specific
error information.
DbiGetErrorEntry:
Returns the error description of a specified error stack entry.
DbiGetErrorInfo:
Provides descriptive error information about the last error that occurred.
DbiGetErrorString:
Returns the message associated with a given error code.
Взято с Delphi Knowledge Base: http://www.baltsoft.com/