When the Windsor station was calling itself "the new WI", the London station was calling itself "the new PL" and in Wingham, it was "the new NX". That was the last 2 letters of their call signs (CFWI, CFPL). When CTV bought them (including the wingham station), they were all branded simply as "A channel". It's prounounced as "Aeigh" channel, but because it's so bland and generic, it seems more appropriate to prounounce it like "a channel" (as in - it's just a channel).
While the anchors of the news casts are largely different between the London and Windsor station, you will see windsor stories (reported by the windsor correspondents) on the London newscast, and vice-versa. The weather presenters are (I think) more interchangable between the two newscasts. I've never seen an actual CKNX newscast, so I don't know who anchors it, or who does the weather, but I know that again it's pretty common to see a few of the CKNX-based reporters run their stories during the CFPL newscast.
Even back when it was "the new WI", there was never any local morning show. They just aired the London morning show (still do).
Again, the only hard and fast rule that I've seen over the years is that Jay Campbell very rarely does the weather on the Windsor station. I think the windsor weather is done in the London studio. And, like I said, during the weather segment on the London newscast, regardless of who is doing the weather, they will NEVER mention windsor, even though on the map behind them the windsor temperature is clearly posted. They will mention chatham, sarnia, grand bend, etc, but NEVER mention or refer to Windsor by name during the weather segment. Strange.
Also, I don't think that the Windsor A channel can be picked up by antenna - only cable. If I'm wrong - what is the channel number?.