Hurray! I can now lock/unlock and remote start both of my Volvos with just one remote using different buttons and combinations. I started with 2 Viper 560XVs (alarm, keyless entry and remote start) installed in my V70R and 740. Kudos to my installer - he does great work! Each car had 2 dedicated remotes. I was not content carrying two identical remotes on the key chain and guessing which car would open/close or remote start.
So, I started by programming each car with a fully functioning/fully featured remote to keep as a spare. Then I got 3 more remotes and programmed the right two buttons on each to be used on one car and left two buttons for the other vehicle!
I spent a few hours messing with the config and reading the manuals. On top of a regular lock/unlock and remote start for each car, I have a turbo timer function for the V70R car so before getting out of the car, I can activate the timer, pull out the key, shut the door and set the alarm, all while the engine runs for another 3 minutes!
The only thing I cannot figure out is how to program a silent lock/unlock. This is for when I don't want to disturn the surroundings with a regular chirp that accompanies the lock and unlock operation. This can be done with a fully functional, dedicated remote, but I think I used up all the button combinations on the dual vehicle remotes.
To make a long story short, I love my Viper alarms and remote starts. I used those for years in other cars and they never fail and they make lots of sense. This particular install makes me really happy because it is very convinient and functional