Well, there are programs which can do it also for win98 etc. but they often aren't free, and cost much...
such programs include
RealVNC -
http://www.realvnc.com/
TightVNC -
http://www.tightvnc.com/
pcAnywhere -
http://www.symantec.com/pcanywhere/
GoToMyPC -
http://www.gotomypc.com
LapLink
etc...
some are free, some aren't, not all programs can do everything, etc. But the rule is that all such programs should be installed on both the requestor, as the receiver's end...
/ 
