Vulnerability Development: ICQ exploit

["Geo." <georger () nls net>]

While playing around with my laptop and desktop today I noticed something
with ICQ.

If you have ICQ setup on 2 machines using the same ICQ number, as soon as
the second machine starts ICQ up the first machine gets an error about your
ICQ number being used on another machine and immediately takes ICQ off line.

I don't know the mechanism that allows this but has anyone considered an
exploit based upon this mechanism? Seems to me a sequential run could knock
a whole bunch of people off ICQ..

Geo.