Dear Imac007 and Magus,
The pointers from both of you were very helpful, I read them all (it seems that the major problem was that I had not turned "Apple Talk" on), and now I am able to share the files on my wife's laptop, but, and I'll be "darn", NOT vice versa!??! :-(((
On her laptop (a MacBook with Intel Duo) in Finder>Go>Connect to Server and entering either the afp://-appropriate address or browsing, I will "find" my laptop's name, click on it to Connect, a window opens up with my laptop's name and the "Select the volumes to mount" request, but NO volume name appears there.
Strangely enough, when I create additional (fictitional) Accounts on my laptop (Preferences>Accounts, +), these new volumes DO show up in the above mentioned window and I CAN mount these volumes!??? This puzzles me on end: why can I see additional accounts, but not my main account, i.e. the admin account on my laptop?
Is there perhaps a setting somewhere that "hides" my account? But I have checked practically all the settings and compared them between the two computers, they seem to be identical.
HELP, can you please HELP? I am going nuts. 🙂
Thanks and cheers,
Veit