These values are returned to the requester as part of pending or final status notifications. Values are updated automatically as part of SendImages, each operation decrementing NumberRemaining, and incrementing NumberCompleted, NumberWarning or NumberFailed according to the status returned. If NumberRemaining is less than the number of images sent by a SendImages call, then NumberRemaining is set to the number of images to be returned by that call. Therefore, if an application intends to return all the images for a request in one operation, then it need not manipulate these values at all, as the DicomConnection object will handle then automatically. If however the application wishes to call SendImages more than once, then NumberRemaining must be set correctly before the first call.