Using Time Machine with My Book World on a second computer

I've just installed a 2TB My Book World on my wireless network and am able to use Time Machine to backup my Macbook Pro, using the log-on WD_Backup but I don't know how to backup my wife's Powerbook, as this seems to be the only log-on name accepted by the My Book World when using Time Machine.
Should I enter the same log-on details in Time Machine on her computer and will this create separate backups for each computer (as I'm worried that the same user name might mean it will overwrite my backup)
Any help or advice most appreciated, as if this is the case, I assume that Time Machine backups will just have to be set at different times for each computer on our network
Many thanks in advance to anyone who takes the trouble to respond
Kind Regards
Bernard

You need to use the same log-in/password details with all computers and Time Machine will sort it out (or at least it has with my MyBook World). Apparently it helps to give the MBW a static IP address, which you do by logging into the browser interface and changing the option from DCHP to Static. Otherwise I've read that Time Machine can struggle if the IP address of the MBW changes.
There are instructions here on how to set it up:
http://discussions.apple.com/thread.jspa?messageID=11110771
And then there are some more details here:
http://discussions.apple.com/thread.jspa?messageID=11110771
especially the bits about the different potential user names/passwords to try if you keep getting an error message when setting up Time Machine.
I had trouble setting it up, but once I'd got it working (to date) Time Machine has worked like a dream, so I wouldn't believe all the criticisms you might find, as I think that so long as your MBW has the latest firmware, Western Digital seem to have got their act together to make it Mac friendly.
You can also check if you need a firmware update via the browser interface - you just need to put the address of the MBW into your browser and I'm sure there must be other ways of finding it, but personally I log into my router via my browser (eg. http://192.168.0.1 for Netgear routers) and click on "attached devices" to find out the allocated IP (192.168.0.??). Once you put this into your browser you will be offered the set-up process for the MBW.
Hope this helps. From my point of view I can only advise you to persevere, as once you get it sorted with Time Machine, it's definitely worth it
Kind Regards
Bernard

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