[Samba] How do I setup a non passworded standard samba user that all windows users can access?

[Stuart Otway]

Hi there,

What are the exact steps I take to create a samba user account that anyone
can get onto and write to even though they may not have a linux user
account.

For Example

john logs onto windows as 'john'
goes through the network to find the samba server. and creates a file (full
permissions).  john does not however have a linux user account.

Is this possible?

I have been told that setting up a generic samba user account that will work
for all who connect to the server.

I am not bothered about security.

thanks very much,
stu