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Extraído del Help de las RxLibs:
TDBProgress component

TDBProgress is a wrapper for a Borland Database Engine (BDE) generic progress callback and (in 32-bit version only) trace callback functions. Generic progress callback is issued by BDE to inform applications about the progress made during large batch operations, such as DbiBatchMove. The Generic Progress Report callback allows the client to obtain progress reports during an operation, and to cancel the operation, if desired. This callback is generated when working with Paradox driver and with some other BDE drivers. The query execution generates some text messages and BatchMove execution generates text and percent notifications. You can specify the MessageControl property and Gauge property to display BDE messages and percentage.

For some operations, a percentage completed is passed back to the callback function, for most others a string containing progress information is passed back; for simple database operations no progress information is returned at all. It has been our experience that percentages are mainly passed back in operations where the BDE must physically sort a local database file, such as in indexing DBase files. It is of course possible to interpret the messages passed back and calculate your own percentage completed.

32-bit trace callback is a system-level callback that can be used to retrieve trace information.

TraceFlags specifies the database operations to track with the OnTrace event at run time while Trace property is True.

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