>Most consumer codes do not have checksums,

Thats been my observation too.

>but it is not uncommon for receivers to only respond
>after seeing 2 correct codes.

True; on the other hand, I have seen protocols that send the burst only once
for each key stroke. That is, if the receiver misses the beginning of the
stream (or any part in between, for that matter), it will not respond till
the key is released, and pressed again. These protocols usually send the
actual data once, and then just a simple pulse every few ms to indicate the
key being still pressed.

Anand Dhuru

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