What happens in the DE version when a fifth spelling request is received? Does the user get an error message?
The limit of four simultaneous spelling requests in the DE version has no undesirable side-effects. The fifth simultaneous spelling request is simply queued internally until one of the first four finishes. From the outside, nothing appears to happen at all. No error messages are displayed, and no exceptions are raised. The user would be entirely unable to tell whether his or her request was the fifth, and therefore queued, or the first, and processed right away. The fifth request is not rejected or discarded; it simply waits for its turn. We like to use the analogy of a barber shop with four chairs to describe the DE version. From the outside, you could see a customer (a spelling request) go in, and some time later that customer would come out (the spelling request would be finished). You couldn’t easily tell if the customer was served right away or had to sit in the waiting area for a while until a barber chair became available. Of course, if it was necessary to wait in the waiting ar
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