BeginIO

initiate asynchronous device I/O

This function takes an IORequest, and passes it directly to the "BeginIO" vector of the proper device. This is equivalent to SendIO(), except that io_Flags is not cleared. A good understanding of Exec device I/O is required to properly use this function.

This function does not wait for the I/O to complete.

ioReq

An initialized and opened IORequest structure with the io_Flags field set to a reasonable value (set to 0 if you do not require io_Flags).

exec.library/DoIO(), exec.library/SendIO(), exec.library/WaitIO()