Prop-2 USB HID Connections to a Host Device?
Working with USB communications at the "bare-metal" level presents many challenges. Many of us have looked for a way to turn a Propeller-2 MCU into a Human Interface Device (HID) such as a keyboard or mouse. Sad to say, you'll need a different MCU that has a USB "peripheral" interface already installed and a library of many USB functions. The USB protocol is complicated and even "simple" projects fail. I know from experience.
Chip suppliers such as Cypress (Infineon), Atmel, Microchip, and NXP offer USB "enabled" MCUs. They may provide application notes and example code
Here there is a good keyboard-emulation example for Arduino Leonardo, Micro, or Due boards:
As far as I know, no USB HID library exists for Propeller chips. I recommend the book, "_USB Complete, 5th edition," by Jan Axelson as an excellent guide to all things USB.