I tried this out on a localhost server with a sockpuppet in a channel.
+k didn't seem to do anything when I tried that (even after /opmode changing the key after kicking myself), but doing +l 1 did close window when I was unable to rejoin.
*edit*
Further test.
+b = window remained open
+r = closed the window
+O = window remained open, but this is most likely due to mIRC not understanding the concept of oper only channels (raw mismatch, etc.)
I'm also assuming that +k keeps the window open after trying it again.
Last edited by Jigsy; 15/12/22 12:31 PM.