[Elecraft] KX2, KXP100, and Computer

[Tim N9PUZ]

I have a KX2 and KXP100 which I would like to also connect to a computer
for sound card modes, etc. if possible. The KX2 manual, on page 9 it says:

An Elecraft KX2 Accessory Cable (KX2ACBL) can
be used to break out the computer control and key out
signals separately. These can then be connected to both
an Elecraft KXPA100 ampflier via its supplied cable.

My question is "both an Elecraft KXPA100 amplifier" and what? The computer?
I think the typesetter dropped a word there and I want to make sure before
I order a KX2ACBL cable.

Also, does the WIN4K3 software suite provide any advantages in control for
this type setup?

Tim N9PUZ