Professional serial communication library - DLL for Windows & MSDOS libraries. Features:* State-driven file transfer libraries allow Xmodem, Ymodem, and Zmodem(w/ crash recovery) file transfers on multiple ports at the same time.* Built-in hardware and software handshaking for flow control (DTR/DSR, RTS/CTS, XON/XOFF).* Asynchronously call user's C/C++ or assembly functions on any serial communication or timed event (receive, transmit, modem, or status change interrupt event, buffer count events, specific character reception, error events, and much more).* Automatic UART type detection; 16650, 16550 support (including FIFO).* Support baud rates in excess of 115,200 baud, with the ability to use today's high-powered communications devices.* Completely port re-entrant, allowing it to be time-sliced.* Complete manual in Help/Hypertext format. HARDCOPY AVAILABLE.* Extensive statistics on every port(bytes lost, sent, received, errors, etc.).* Only library that really allows you to combine different multiport cards in one PC under MSDOS including Digiboard, Arnet, Boca Research, GTEK, etc.* Very easy to use (short learning curve).* Same API for Windows and MSDOS.* Extensive set of examples.Supports:* Microsoft Visual C/C++, Borland C/C++, Access, Visual Basic, Professional Basic, QuickBasic, & all compilers & tools that can call DLLs (e.g. LabView, Delphi, etc).* Virtually all Hayes compatible modems.* Any number of ports running concurrently* Any device that has a Windows serial communication driver (multiport card, USB - serial hubs & modems, PCMCIA).* Windows XP, Windows 2000, Windows NT, Windows Me, Windows 98, Windows 95, Windows 3.1, MSDOS.