PowerBASIC RS232 serial port communications component library. Features include: Supports 256 ports, control multiple ports simultaneously, fully thread safe, modem control, serial line status and control, ASCII/XMODEM/YMODEM. Uses the standard Windows API to communicate with any device connected to a serial port (scale, modem, fingerprint scanner, printer servers, etc). State driven Xmodem and Ymodem on multiple ports simultaneously (up to 256 connections). Can send Windows messages on completion of events (incoming character, etc.). Supports virtual serial ports (USB to serial converter, Bluetooth serial). Includes multiple PowerBASIC example programs. Use with all versions of PowerBASIC (PB/CC, PB/DLL, PB/WIN). Does not depend on support libraries. Makes calls to Windows API functions only. Can also use with C/C++/C#, Delphi, Visual Basic, Visual FoxPro, Visual dBase, Xbase++, and COBOL. Can be ordered with or without C source code for the DLL. Free technical support and updates for one year. Requires Windows PowerBASIC (PB/CC, PB/DLL, PB/WIN). Supports Windows 95/98/Me/NT/2000/2003/XP/Vista. The evaluation version of WSC4PB is fully functional and can be downloaded from http://www.marshallsoft.com/wsc4pb.htm.