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+OPAL_CHECK_ASYNC_COMPLETION
+===========================
+
+OPAL_CHECK_ASYNC_COMPLETION checks if an async OPAL pending message was completed. (see :ref:`opal-messages`).
+
+Parameters: ::
+
+       buffer to copy message into
+       sizeof buffer to copy message into
+       token of the message
+
+
+Return values
+-------------
+
+OPAL_PARAMETER
+  buffer is NULL or size is < 72 bytes.
+  If buffer size < 72 bytes, the message will NOT be discarded by OPAL.
+
+OPAL_SUCCESS
+  message successfully copied to buffer.
+
+OPAL_BUSY
+  message is still pending and should be re-checked later.