window refnum_or_swap <refnum>

This atomically makes the given window both current and visible, without failure. If the window is visible, then the client makes it current, as window refnum would do. If the window is hidden, then the client swaps the window in and makes it current, as window swap would do. This action never fails unless you specify a window that doesn't exist.

This operation first appeared in EPIC4pre2.001.