Grappling multiple opponents

[Flame Effigy]

So I'm looking at Grappling Master which allows you to grapple two oponents at once when using the Grappling Style feat.

Grappling Style elimates the -4 penalty for grappling a foe with one hand.

So without these two feats, is a player still able to grapple two opponents by taking a -4 penalty each time? I don't see anything in the grapple rules about one person grappling two, but there are rules for two people grappling one.

[Aydin D'Ampfer]

Grapple never specifies that you need a free hand to grapple, just that bipeds without two free hands get a -4 penalty. This is the penalty that Grabbing Style eliminates.

The rules for grappling two people: Unless you have a way to grapple twice in one turn, you will never be able to grapple two people. A few ways to do this:

Ki Throw/Binding Throw & Maneuver Master
Greater Grapple
Have a Grab weapon (Tetori monk)

Now, assuming you have this ability, you will simply have to 'target' each opponent at a time, as well as maintain each grapple individually. Nothing special other than that.