Transparent Distributed Processing (also known as Qnet) is just another protocol (like TCP/IP) that transmits and receives packets. The Qnet module in Core Networking is a loadable shared module, lsm-qnet.so.
To start the stack with Qnet, type this command:
io-pkt-v4-hc -ddriver -pqnet
(assuming you have your PATH and LD_LIBRARY_PATH environment variables set up properly). You can also mount the protocol after the stack has started, like this:
mount -Tio-pkt full_path_to_dll/lsm-qnet.so
For command-line options and general configuration information, see lsm-qnet.so in the Utilities Reference.