[Pathfinder] Question about grappling...

[Bickerstaff]

In the Core Rulebook it says:
Humanoid creatures without two free
hands attempting to grapple a foe take a –4 penalty on the
combat maneuver roll. Does this mean that by taking a -4 penalty to my grapple roll I can grapple someone with one hand, keeping the other hand open for something else, like a sword?

Follow-up question: If I can, in fact, grapple someone with one hand, while wielding/attacking with a weapon in the other? Assuming one would be willing to take the associated penalties of course.

[W3bDragon]

If you are holding something in your hand you'd rather not drop, say your weapon, and still want to attempt a grapple with one hand, you take a -4 to the check. However, if successful, both you and your target gained the grappled condition, irrespective of whether you used one or two hands to initiate the grapple.

As far as I can tell, only creatures with the Grab ability have the option of grappling a target without gaining the grappled condition by taking a -20 on the check. That leaves them free to act without the restrictions of the grappled condition while still grappling a target.