Accessing remotely over the net or over the LAN via WiFi?
You can use one of the many RDP apps on the Market to poll your PC over the net or LAN but for the net you'll be needing to set up a DynDNS account and enable it on your router then forward the RDP ports to your machines fixed LAN IP address only.
That way when the app asks to connect via RDP the machine's wake on lan function will kick in when the router sends the connection request.
You can use one of the many RDP apps on the Market to poll your PC over the net or LAN but for the net you'll be needing to set up a DynDNS account and enable it on your router then forward the RDP ports to your machines fixed LAN IP address only.
That way when the app asks to connect via RDP the machine's wake on lan function will kick in when the router sends the connection request.