Serial Port Control is an inexpensive royalty-free ActiveX component. You can use it with any ActiveX-enabled development environment, such as VC++, VB, Delphi, etc. Just put it on a form and vou've got all the functionality you need to access an RS232 port. The event driven architecture makes it a snap to use. Just define a function in your program and it will be triggered automatically when new data is available through the port.

Creates virtual COM ports directly from your own programs and fully control them! Virtual ports look like real hardware serial ports for all serial communications applications. On the other hand, developer API allows your program to access data written to virtual serial port by communications application and to respond with your own data. OEM license allows you to distribute this ActiveX control as a part of your software.