an serial communication library based on the Windows API
Edit by : The Windows Standard Serial Communications Library for Visual dBase (WSC4DB) is an serial communication library based on the Windows API. Includes 28 functions + modem control, XMODEM and YMODEM protocols, and a selection of example programs. Features include:

* Free technical support and updates for one year.
* Royalty free distribution with your compiled application.
* Includes 16-bit (WSC16.DLL) and 32-bit (WSC32.DLL) versions.
* Evaluation versions are fully functional. No unlock code is required.
* Can control any serial device connected to a serial port.
* Can be used from GUI mode or console mode programs.
* Can control multiple ports simultaneously.
* Includes hardware and software flow control.
* Is port re-entrant.
* State driven Xmodem and Ymodem on multiple ports simultaneously.
* Is fully thread safe.
* Supports Windows 95/98/Me/NT/2000/XP/Vista/Windows 7.
* Can send Windows messages on completion of events (incoming character, etc.)
* Works with all versions of 32-bit dBase.
* Does not depend on support libraries. Makes calls to Windows API functions only.
* Can be used with any language (C/C++,.NET, Delphi,Visual Basic, VB.NET, etc.) that can call the Windows API. you can free download Windows Standard Serial Communications Library for VBase 5.0 now.