PATHHardware Documentation > USB Devices > Mac OS USB DDK API Reference

Pipes

A pipe represents the communication link between a USB device endpoint and the host software. Data moves to and from the USB device through the pipe. Pipes have two communication modes, stream and message, and four transfer types, control, isochronous, interrupt, and bulk.

For a detailed descriptions of USB interfaces, endpoints, pipes, communication modes, and transfer types see the Universal Serial Bus Specification, which can be found at http://www.usb.org.

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