Sending real-time data (RTD) across network to excel clients

I need a stock quotes application with RTD functionality to send quotes by request across the network - such networked clients will use Excel to read the data. As such, other PCs on the same local network should be able to access the same RTD functions as those on the computer with the RTD server / app. The RTD server has no DCOM functionality, as far as I can tell. Both clients and server run Windows 7.