I am curious as to the nature of the IR codes used for the BDP94HD DVD player (and presumeably others). I do not use many Pioneer products outside of the TVs which I tend to use 232 for.

The Pioneer documentation lists "Command 1" and "Command 2" codes for each function. For example:

Power On:
Command 1 {A1 81}
Command 2 {AF BA}

I used IRTool to look at the code information for each function and it returns information for two codes which correspond to the hexadecimal documentation.

Command 1 {d161 f129}
Command 2 {d175 f186}

Are the two commands required for each function? Are they two different commands for assignable control? Is one a press and the other a release? I searched for info on this but came up empty handed.