Bingo! Well, almost. I have to use ttyS1 instead of modem. I have to su root first, then my Konsole feedback is as follows:
linux:/ # lsof | grep /dev/ttyS1
pppd 5742 root 8u CHR 4,65 8774 /dev/ttyS1
Figures, since modem is just a symlink in the /dev/ directory. Haven't tried it yet, since the netzero dialer has so far been disconnecting. Thanks!