Terminal emulation component

I'm writing a appliation that uses a custom protocol to do telnet-like
communications, and I want to add terminal emulation (preferably a
good number of emulations like vt100, vt220, ansi, tn3270, etc).  The
ones I've found, however, are too closely coupled with another comm
method.

I've looked at the Dart product, but either the internal or external
telnet are required.  The internal telnet doesn't do my protocol.  The
external is designed for non-interactive use.  I've also looked at
SocketTools, but it is tied to a serial port.  I've looked at some
others, but they all are too closely tied to either a telnet
application or a serial port.

Does anyone know of a terminal emulation component that provides
interactive terminal emulation?  For example, if the user types, I
want to know what they type (including special characters, such as F1,
ESC, etc) so it can be transmitted.  I also want the ability to send
data to the virtual terminal and have it displayed.

Any help is appreciated,
Pete