If i remember well, in Generals there are 3 kind of healling types:
> Home Structure Healling
> Veterancy Healling
> Special units healling radius
1. Home Structure Healling is the place/structure where the unit is created and can go (if commanded by the player) to heal it self. Examples: Barracks, Airfield, War Factory...
2. Veterancy Healling is the behairvor that the unit have to self heal...when it gains teh veterancy.
3. Special units healling radius are structures/units, like the Ambullance and the Propaganda Tower that can heal/repair the units if they are on it's radius...
However I have never seen this module on any CNC codes...are you sure that it's for GENERALS? But i can be wrong
HEAL_PAD should be the "Home Structure Healling", but since i'm travelling i can't take a deepth look into the code to help you. I'll try to see this when i get home.
But i hope that i helped you with these informations,