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        #
        <Other Task code>
        }

See the libusb-win32 manual for more information about the methods. The
functionality is the same as the libusb function whose name is
the method name prepended with "usb_".

Generally, define a $Context variable which the library will use to keep track of
the asynchronous call. Activate the transfer (read or write, depending on the
endpoint) using submit_async() as shown, then loop calling reap_async_nocancel()
while checking the return code.

You can have any number of async operations pending on different endpoints - just
define multiple context variables as needed (ie - $Context1, $Context2, &c).

=cut


##########################################################################################
#
# Version 0.34 - Added support for asynchronous I/O
#
# The caller supplies a scalar $Context which we use to keep opaque (from the caller)