Forums Bug Reports Assuming PART is always successful

Apparently when you close a channel window, mirc fakes the receipt of a PART message from the server and then sends a PART command to it. From the scripter's point of view, this allows the usage of the on PART event as a form of on CLOSE event for the channel window. The main use of that is presumably the ability to do something like this:
ie to be able to specify a default part message (either global or per-channel/network), sort of like you can specify a default quit message in Options. This way mirc sends two part messages, first the one you specified in the on PART event and then the internal one (which mirc sends anyway). The second PART command results in a "No such channel" response from the server, but mirc hides that message, so the user doesn't notice anything.