All Users is a group.
Default Account is (i think--cause I don't use it) an auto-login account. Not what you want.
Yes, you have to define all your users on all the computers (that's why domains are so popular--one ID to manage). All the passwords (for a particular user account) have to be the same too.
Take a share, "Downloads" for example.
Create a group on the 24/7 PC called: "Download FC"
Add your account, and anybody else's who wants/needs to be able to create & delete files in the share.
Now, create a folder on the 24/7 PC, called Downloads. Now share the folder, calling the share Downloads as well.
Now, go to the Share Permissions tab on the share (not the folder). With the Everyone group highlighted, uncheck the Full Control and Change boxes at the bottom.
Now click Add, and choose the group you created earlier (Download FC). Check the box for Full Control. Click OK to close out the properties box.
What you've just done is:
Created a share called Downloads, and granted some people (Download FC) the ability to read, write & delete files in the folder on the 24/7 PC, from the network. You've also restricted everybody else on the network, to only being able to read the files/folders in that directory.
Note: Because we changed the Share Permissions, not the Folder permissions, anybody who logs in at the console (right at the PC) on the 24/7 machine, they WILL be able to modify and delete files in the "Downloads" folder on that machine.
This sounds long & tedious, but it's really not that bad. It goes much faster the next time around. Notice that instead of granting individual users the Read/Full Control permissions, I granted it to groups. That way, when you create a new user, all you do is put them in one group or the other, and they automatically get the rights. You don't have to go back to each shared folder, and grant them the rights individually.
--Woodie