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Each message line shown in Messages view contains a 'P,' 'S,' 's,' or 'R' code. These codes have the following meanings:
| Code | Meaning |
|---|---|
| P | The message was posted to the queue with the PostMessage function. No information is available concerning the ultimate disposition of the message. |
| S | The message was sent with the SendMessage function. This means that the sender doesn't regain control until the receiver processes and returns the message. The receiver can, therefore, pass a return value back to the sender. |
| s | The message was sent, but security prevents access to the return value. |
| R | Each 'S' line has a corresponding 'R' (return) line that lists the message return value. Sometimes message calls are nested, which means that one message handler sends another message. |