Asynchronous Execution of Routines
is, that can return control to your application before it has completed
execution) takes as a parameter a pointer to a parameter block known as the
asynchronous parameter block. If this pointer is NIL, the routine does not
return control to your application until it has completed execution.
Note: The asynchronous parameter block is passed on to the
database extension, which is responsible for implementing the
asynchronous routine. If the database extension does not support
rcDBAsyncNotSupp result code and terminates execution of the
routine.
parameter block.