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Create nsysuhs.rpl page with intro
nsysuhs.rpl is the system library that provides low-level USB device access. It is a wrapper over the [[/dev/uhs]] IOSU interface, and is meant for USB peripheral drivers. Despite nsysuhs.rpl's presence in OSv11, it is impossible to load with OSDynLoad_Acquire(), at least in the web browser; doing so returns no error but an invalid handle. There is one known library that performs low-level USB operations, [[usb_mic.rpl]], but it includes its own copy of the nsysuhs.rpl functions. This seems to imply that nsysuhs.rpl was not meant to be used directly be anything.