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#### TFDDs

The internal structure of file variables (`FileRec` and `TextRec` in BP's `Dos` unit and `TFileRec` and `TTextRec` in BP's `WinDos` unit) is different in GPC. However, as far as Text File Device Drivers (TFDDs) are concerned, GPC offers a more powerful mechanism. Please see the RTS reference (see Run Time System), under `AssignTFDD`.