Splitting a Signal Box Data Stream

[Tony Parker <tgparker@xxxxxxxxxxxxxxxx>]

Hey Realtrading Gents:

I've been having fun trying to split a DBC Signal Box's output to
two Workstations.

I'd like some input from anyone who's tried and succeeded same.

I want to send one data-stream to TS 4.0, and then to a venerable
DOS version of Signal that works better than Windows versions of 
3.0 or 4.0.

Question: can this be done on one work station, can one get the
two apps to "share" the com port, or do I need to "split" the
signal and send to two PCs.

Feedback please!

TIA