port to port connection

Utility for monitoring and setting the individual bits of the Parallel port

Using the COM Port in VB.NET

This program allows you to view and control parallel port on hardware level.

Free Serial Port Monitor, RS232 Com Software Sniffer

Free debug tool for serial port, TCP/IP and UDP port communication.

Free debug tool for serial port (RS232), TCP/IP and UDP port communication.

Free Port Scanner is a small and fast port scanner for the Win32 platform.