409 is the basic free version. then theres the registared version of 409 which opens everything up rather than just the 1st 20 measuring blocks on each sections, along with all the function tests ( cant remember if they are in the unreg. version)
409 can only be used on the Mk4 varients, up to around 2004/5
then theres 7xx and 8xx both use only ross techs official cable, circ £200, these can be used on the more modern CANBUS varients 2005 >. unfortunately you need the correct cable for it to be backwards compatible with the earlier ECUs
spend time learning some of the basics - TBA being the main one much better than allowing the ECU to adapt itself