The protocol used in both cases is PCCOM, which stands also for the program
name used inside Geos for the "file transfer" feature.
You will find find a short description in my Zoomer page :
http://web.ensem.u-nancy.fr/~pdallema/ZOOMER.HTM#PCCOM
If you want to use "file transfer" between a Zoomer and a machine wich does not
include Geos (Ensemble or New Deal Office) you may download the ZDOS program
or the ZCOMLITE bundle for a PC :
ftp://ftp.biostat.washington.edu/pub/zoomer/
or some other com software for a Macintosh (not tried) :
ftp://ftp.biostat.washington.edu/pub/zoomer/Mac
If you want some on-line communication packages, you may use the AOL client
embedded in the Zoomer or the Bullet (also for AOL) or the Compuserve Client
(available on Compuserve) or other comm programs for Geos (GeoComm ?...).
Each of them may use different protocols, I don't know precisely.
I hope it helps.
Philippe.
pdallema@ensem.u-nancy.fr
http://web.ensem.u-nancy.fr/~pdallema