How many can be used at once?

[Shannon]

Nicely put, K-Train.

Lkawakita, remember that an aura is a projection of energy. It takes energy to project and maintain that. So aura projection programs are considered Type B semi-hybrids, and can be used with Type C or D programs as if they were Type B standard, but they do use more energy than a standard Type B.

Thank you Shannon.
Regarding type D programs, if one is related to another, would it be wise to use together?
I've saw someone mention the Ultra Success + Luck Magnifier combo. As there is a type B Ultra Success, I assume that one is used in the combo.
But what about the 4G one? Can it be used on that combo?

You're trying to take a mile when I give an inch. The only case where it is possible is the one stated.