How to create a virtual serial port?

[Ned Deily]

In article <6LGdnSbyPsL1fX3UnZ2dnUVZ_uqdnZ2d at pdx.net>,
 Scott David Daniels <Scott.Daniels at Acm.Org> wrote:
> This part I actually understand.  The OP has a program named
> "RouteBuddy" that talks to a device over a serial port, and he
> want to repalce the data stream coming from that device.  My
> question is, "where does the device that he wants to replace
> plug in?"  I don't see anywhere on my laptop I could plug in
> anything but a USB connector, an ethernet connector, a firewire
> connector, headphones, speakers, a display connector, or a
> power cord.

A number of vendors (Keyspan, Belkin) make USB serial ports.  FWIW, I 
use one here on this iMac and OS X with screen(1) and a null modem cable 
to act as a serial console for a headless Linux box.

-- 
 Ned Deily,
 nad at acm.org