window previous

This operation does a window swap with the hidden window whose window number is the next smaller refnum than the current window's refnum. If there are no smaller refnums than the current window's refnum, then it will wrap around to the highest refnum. For example, if the current window is refnum 5, this would swap with window refnum 4. Doing it again a second time would swap with window refnum 3, etc.

This creates a circle queue with your hidden windows, visiting each one of them in numberical order. When you reach the smallest refnum, it will wrap around to the window with the highest refnum.

This function already existed in ircII.