If they are both connected to the same router, and if your WinXP firewall has been setup to allow the IP-Address of your Linux PC (laptop) to connect, and if your winXP PC has file sharing enabled (with directories shared), then if using KDE on openSUSE simply open up konqueror and type in the location bar:
where “user” is your user name on windows PC and “ip-address-of-windows-pc” is the ip address of the windows pc. I have not done this for a while, so its possible you do not need to enter the user name. That will give your openSUSE PC access to the Windoze PC
If you wish quick access to the Linux PC from the Windoze PC, open up port#22 in the openSUSE pc firewall. Down load the application winscp to the Windoze PC and install winscp on the windoze PC. Then run winscp on the windoze PC to access openSUSE laptop.
You can use either a router or a crossover cable to make a wired connection between them – or if they’re both using wireless that link will do fine. Once linked you can set up a small LAN of two computers using Samba.
Samba actually do the thing.
Just make sure you have the client installed (by default, it is) and then use Nautilus (gnomish) or konqueror (kde-ish) or whatever file manager you want to browse through your network folders → samba shares.
obviously, you should setup a shared folder on your win box.
Another solution which i often use is to setup a ftp server on my suse box and then connect to it from a ftp client on another box (winOS or something else)
hope it’ll help.
[Edit]: Arf! so faaaast here. they already distance me on my answer.
The Tutorial I linked was for a SOHO LAN. For just two machines and no router yo can’t use DHCP. Instead you can install in each a Fixed IP address and connect them by the crossover cable to exchange files and so on. To get fixed IP addressing, in Yast → Network Devices → Network settings → Edit → Statically assigned IP address.
I now think that you want one computer to be the computer connected to the Internet and the other computer sharing files with the first and also connecting to the Internet through the first? That is, I think you want to set up Internet Connection Sharing ICS as well as file sharing? Is it file sharing or ICS or perhaps both?