But you can apply it to TCP as well (only at a kernel/raw socket level), which Apple and Microsoft have already done, which makes it simple for software to use;

But you can apply it to TCP as well (only at a kernel/raw socket level), which Apple and Microsoft have already done, which makes it simple for software to use; Apple uses it to download o/s updates in the background. Implementing it in the kernel also makes programs like “trickle” much easier.