I checked just to be sure, but unfortunately, Textmaker (2002) does not support the "track changes" function. Apparently, it is in the works for the "next version", but I have no idea when that's coming out, nor how long it'll take for the feature to trickle down to the Zaurus version (logically, I would think it would be fairly soon after the Linux version comes out, but who knows?).
Yz