HID Utilities

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Apple HID Utilities is an API built on top of Apple HID Manager. It is provided as free software which can be used or modified. The aim was to create a higher level API than HID Manager for developers to more rapidly develop applications which use USB HID devices but do not need the flexibility of the lower level HID Manager.

[edit] Problems

It was designed with games in mind, so it can limit flexibility for other situations. It uses its own list of devices, and creating that list can take create a high load on the computer. Internally, it uses a number of global variables, which means that multiple instances connected to the same device queue will steal events from each other.