A DisplayPort signal can be multiplexed onto a Thunderbolt cable. In fact, multiple DisplayPort signals (Intel Cactus Ridge 4C) can be multiplexed onto the same Thunderbolt cable.
Multiple Thunderbolt monitors may be daisy-chained on the same Thunderbolt cable, provided that the graphics card in the PC supports this.
However, a passive Thunderbolt to DisplayPort adapter may only be connected at the end of a Thunderbolt daisy-chain.
I'm confused as to how Thunderbolt monitors can be daisy-chained in light of the restriction on passive DisplayPort adapters above. Does each Thunderbolt monitor contain its own PCIe graphics card? Is there a special Thunderbolt to DisplayPort chip that can be daisy-chained to other devices?