You cannot remote *into* a Windows Xp Home machine natively - but you can
use the Remote Desktop Client to remote into another machine *from* a
Windows XP Home machine.
START button --> RUN --> MSTSC --> OK.
You could install the TeamViewer Host module on the Windows XP Home
machine and set it up so you can use TeamViewer to remote to it. Little
muss and fuss that way (with routers/firewalls/etc.)
You could also use VNC (of some flavor) - although the setup is qa little
more involved, the client you use on the other side is more readily
available.