Selling iMac, how to setup software

Question

I'm selling my G3 iMac, and would like to install the software so that no name is on the computer, just like when you first buy it. Ideally, I'd like the buyer to get the setup assistant the first time they boot up.
I'll be installing 10.2.
The other part of this that bothers me is how to do the system updates without creating a user account.
Thanks,
Boris

Answer 1

Well, here's one way:
Follow these instructions step by step to prepare a Mac for sale:
First, back up the data:
1) Shut down all Virtual PCs. They cannot be in their "fast saved" state. They must be shut down from inside Windows.
2) Clone to an external drive using Carbon Copy Cloner.
Next, prepare the machine for the new buyer:
3) Deauthorize the computer in iTunes! Deauthorize both iTunes and Audible accounts.
4) Remove Open Firmware passwords
5) Turn the brightness full up and volume nearly so.
Install a fresh OS:
6) Insert the OS X install CD/DVD.
7) Restart the computer while holding down the C key to boot from the CD/DVD.
8) Run Disk Utility from the file menu and erase the internal hard drive (optionally zero all data).
9) Install OS X.
10) Reboot the computer.
11) From the welcome screen, you can skip the registration step by typing command-Q.
12) When prompted, create an account (it will be an admin account).
13) From your new admin account, configure networking.
14) Then use Software Update to bring your system and all of it's applications up to date.
15) From Disk Utility, repair permissions on the new volume.
Now delete the account you just created:
16) Boot from a different volume (e.g. a firewire drive, if available)
17) Clean up the image using the following terminal commands:
prompt> rm /Volumes/<imagevol>/var/db/BootCache.playlist
prompt> rm /Volumes/<imagevol>/var/db/volinfo.database
prompt> rm -r /Volumes/<imagevol>/var/vm/swap*
18) Now you can get rid of the admin account you used to set up the machine Use the terminal:
prompt> nicl -raw /Volumes/<imagevol>/var/db/netinfo/local.nidb -delete /users/<admin>
prompt> rm -r /Volumes/<imagevol>/Users/<admin>
prompt> rm /Volumes/<imagevol>/var/db/.AppleSetupDone
19) Shut down and ship it to your buyer. When they get it, it will boot to the Welcome screen just like a factory Mac, except that it's better because it's completely up to date.
A shorter variation on the theme is as follows:
There is another way that does not require an external drive from which to boot. One would perform the same "deauthorizing, formatting, reinstalling" steps as outlined by Kappy, then the following:
Once you have installed and updated OS X and all of your desired applications using your "temporary" admin account, enable the root user and log in as root.
From the root account, look in the "Users" folder and drag your temporary admin account's HOME folder to the trash, then empty it.
Immediately restart the machine and hold down Apple-S to boot into single-user mode. Once booted in single-user mode, perform steps 1, 2, and 4 in section III of this kbase article, making sure that you follow the instructions at the top of! the article for correctly mounting your HD as read/write in single-user mode (step # 1).
After performing the above steps, type the following, followed by a <RETURN>:
sync;sync;sync
Now, simply turn the machine off by holding down the power button. When the new owner starts it up, it will start up in the Apple Setup Assistant.