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The various Exec functions such as DoIO(), SendIO(), AbortIO() and
CheckIO() operate normally. The only caveats are that CMD_WRITE may cause
your application to wait internally, even with SendIO(), and a task using
CMD_READ to wait on a response from a console is at the user's mercy.  If
the user never reselects that window, and the console response provides
the only wake-up call, that task will sleep forever.

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