Originally Posted by kbmb
Well, the router is involved....it's just keeping traffic local.
Pretty sure the iPad and TiVo don't setup a ad-hoc network.
The router is not involved. The DHCP server (coincidentally contained in the router) gave both devices an IP address. If both IP addresses are in the same broadcast domain then they communicate with each other at the MAC layer level by sending out broadcasts on the local subnet. The router is not involved for these activities.
If the wired and wireless parts of the network were on different IP subnets then the router would be involved.
The router doesn't "keep things local". That is done by different switch/bridge devices in the network. The router routes traffic from one network (such as your local subnet) to another network (like the first hop at your ISP).
To put it another way. You could give the TiVo and iPad static IP addresses and hit the router with a hammer so that it wasn't working, and as long as both the iPad and TiVo had IP addresses in the same subnet then the local streaming should work.