Multiple threads?

[webmasterpdx]

I often like to test various algorithm inventions of mine on my calculator, and one thing I'd like to simulate is multiple threads. e.g. I have a new encryption algorithm, but the complex part of it is the interaction between 2 devices. Simulating this involves running 2 programs at the same time, interacting with one another. I guess I could emulate it by running one function as the "transmit" device and any data sent is stored in a variable. Then I can call another function as a "receive" device, effectively implementing multiple threads by sequentially calling functions to simulate each step in a round robin configuration. I was just wondering if anyone has played around with this kind of functionality, implementing some kind of multiple threading on the Prime. Also if the HP guys on this forum could tell me, does the prime run multiple threading under the hood (like an RTOS or something)?????
Thanks in advance.
-Donald