I have it on good authority, if you type Google into Google, you can break the internet.
Using the 1551 is pretty easy... Start off with Rapid Data Transfer, option 1 as I recall, then the address number as the same as they are listed in VCDS. 01 for engine, 08 for HVAC, 56 for radio and so on. Input the 2 digit address and then hit [Q] to scan said address. Then the functions are the same, 08 for Measuring Blocks, 04 for Basic Settings and such...
I learned on the 1551, after I got my number right.. why do I keep getting readiness when I'm trying to scan the airbag?
Jack you are right ecu selection is hex (0x01 = Engine), but i think it confuses non programming users, when you describe 0x01.
Do you enter 0x01 in the VAG1551 ;-)
Just my opinion, write 0xXX if you prefer.