Simultaneous shutdown: halt of multiple computers possible via ARD 3.x?

We had a strange incident that I hope somebody can explain.
One morning, everyone working on their iMacs were restarted at the exact same moment, with no explanation.
Is it possible one of our IT guys (denies) or a hacker did this via SSH or ARD?
If so, how do I know which one it is? (is there an ARD log somewhere?)
(On a network of 30 Macs, all of which have ARD 3 clients)
All logs had the equivalent entries:
June 29 08:11:26 iMac-001 shutdown: halt by joe:

A thought or actually more of a guess.
If you have Workgroup managment, it could be possible that someone created an admin group or perhaps gave admin privliges to an entire already existing group. That would give each of the individual users in that group(s) admin privlieges. Of course to do this would, as near as I know, require you to have 10.4 (maybe 10.X ?) server controlling the system. I have not worked with the Workgroup functions of Server so I can not be definite on this. (We have a primarily Windows based campus system using Active Directory and the network admin is EXTREMELY RELUCTANT to let anyone even near his server or server software.)
Another thought, since the message you list says HALT not shutdown, that makes me inclined to think more so that it came in as a Unix HALT command. According to MAN HALT a Halt -L will NOT write anything to the systems log. You may want to check out the info in Terminal man halt Note that a HALT will result in a system powering down so it may be what you had.
One thing I would try is to change the local administrator account password and change the settings to let anyone else who may presently have admin privlieges, to a non admin level. If you have unknown users that can not be confirmed as being valid users, you may want to dump them regardless of privliege level.
Does your User directory show any logins from joe, susie or whatever, that you can not verify as supposed to be able to be on the system? Another thing that might tell you something is to check the Reports menu from ARD 3 to see who may have logged in and where they logged if from (console or other) and what time they logged in.
Just a few thoughts.

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http://home.comcast.net/~foodandart/Network%20Library.jpg - you can see that I haven't added the Clapton, BBC, Roxy Music, etc, to the library lists for the entire house.
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Okay, i've been looking all over for a simple answer to this problem for a while and haven't found a solution that doesn't involve paying for third-party software or a lot of seemingly unnecessary hassle. Here's my situation:
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I have a similar problem. Wish I had an answer but am struggling with a similar problem. My situation is this: I have a Imac and a Macbook Pro. I have the same 4 accounts on both and I sync them through '.mac'. It works fairly well. My goal is to get one Itunes library accessible from the 2 computers and the 4 accounts per computer. I am also using Time Capsule/Machine as well. I currently keep the Itunes library on an external drive (not TCapsule). So, my problem is this:
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2. How to access Itunes store from all of the accounts on machine 2?
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I have a family of 6, we each have various ipods (iphone, ipod, nano, shuffle, etc), and we have multiple computers -- some Mac and some PC.
We need to understand what factors impact the ability to put a particular track on one or more devices, manage a given device from one or more accounts on one or more computers, and share, as allowed, between devices, people, iTunes libraries, iTunes store accounts, for both purchaed tracks and MP3 files that we might already own, etc...
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Can anyone suggest any references for this? I assumed it was simple, but anyone who has recently plugged a "guest" iPod into another computer will know this is not the case after having been rewarded with the choice of wiping all content off of the iPod, or somehow transferring the content to the friend / family member (with no clear indication of whether this also comprises transferring the content away from the original user, nor how, if possible, to undo such a move later, etc...)
I have seen an article relating to using multiple ipods with one computer, but it does not address all of the issues -- for example using one ipod with multiple computers, etc...
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Let's see if we summarise the main points that will help you decide on a strategy:
+ An iPod can automatically sync (one-way transfer from iTunes to iPod) with just one iTunes library.
+ An iPod (but not an iPhone) in manual mode can accept tracks from multiple libraries.
+ iTunes can transfer (copy) purchases from an iPod into the library if authorised for the account used to purchase them.
+ Networks, memory sticks, portable hard drives, CD-R, DVD-D and iPod to PC transfer programs can be used to move other content between your libraries.
+ The new "home sharing" feature probably has some relevance too, but I've not explored just what the capabilities are.
+ For each account, DRM puchases can be authorised on up to 5 computers at any one time.
+ For each computer, up to 5 accounts may be authorised on it at any one time.
+ Each iPod may hold DRM content from up to 5 different accounts.
+ DRM content may be transfered to as many iPod's as you wish.
+ Most iTunes Store content is no longer subject to DRM, the main exceptions being Movies & Games/Applications.
+ iPods can be formated for use with either Mac or Windows. You can manage content on a Windows formatted iPod with either system, but the reverse is not the case. Firmware updates & restores must take place on the native system.
+ An undocumented/unsupported feature is that if you clone a library (make a complete copy of the iTunes library files and media content) and place this on another machine, an iPod "synced" to the original library will also see any clone as its "home" library. Once cloned you don't have to keep all the content available in each locataion. For regular iPods if syncable content cannot be found corresponding files on the device will be left alone (not updated or deleted).
+ The main database file of an iTunes library can only be opened by one process - multiple users on the same computer or over a network will lead to problems. Always close iTunes before switching profiles.
+ The media content folders can be simultaneously accessed by multiple accounts.
+ Automatic syncing has a number of advantages. You can update tag info. in iTunes knowing that when updated the iPod will recieve all the updates. Using playlists you can manage the content that will go on an iPod without having it connected. Ratings & playcounts can sync in both directions. All the content required to restore your iPod is in one location.
+ Manual management allows you to add content from whichever library you are connected to.
+ iTunes does not keep track of files moved or updated by other programs or instances of iTunes. If you share content folders then it is best to avoid the *Keep iTunes Media folder organised* option. When you update content on one machine, e.g. change a capitalisation or correct a spelling, other libraries will only notice the change if they access the file in some way, e.g. by playing it.
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*Personal Case history:*
Our family has an iPhone, a Nano, 3 Classics (old & new) and a 5th gen. I started by making most of the purchases on my account, putting the children's gift cards onto my store account for example, but two now have their own accounts. I manage most of the music in one main library that sits on a network. One child has a separate library which started as clone of the original and then had content that he dislikes removed... This means I can update his iPod at either his machine or mine although if I add any of his music I have to remember to update both libraries. When he uses iTunes on his computer he only sees the rock/blues/metal that he likes whereas the main library has everybodys content lumped together.
All the iPods are set to sync automatically using the method two (Sync with selected playlists) from the Apple support document How to use multiple iPods with one computer, although I have a slight twist. Rather than regular playlists I set the grouping field to indicate which users should receive which tracks and create smart playlists based on the content of this field.
e.g.
"Alice's Tracks" is "Playlist is Music" + "Grouping contains Alice" + "Kind contains audio"
"Bob's Videos" is "Playlist is Music" + "Grouping contains Bob" + "Kind does not contain audio"
Tracks that both Alice & Bob want on their iPods have the grouping set to "Alice/Bob"
etc.
This way each of us gets a different selection of content to suit our tastes and the capacity of our iPods. An advantage of using the grouping field is that it is stored in file tags (for non-wav audio files anyway) so that it is relatively easy to recreate the playlists should the iTunes library get trashed. Also useful if you move files about manually as playlist membership is preserved when you delete & re-import the tracks.
However you choose to do things you should also create a backup. My main library gets synced to a portable hard drive using SyncToy 2.1 (Windows) which I sometimes take to work and sync there, giving me three complete copies of my library at any one time and I can update any iPod from any instance of the library. An occasional scan of the contnet folders with iTunes Folder Watch helps me catch up if, for example, a podcast has download at one location but the library is overwritten with a newer version from the other.
Hope that's given you some useful food for thought...
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My question is when the new iMac arrives how do I use my external HDD (with iTunes still on it) with the new iMac. My other question is, right now when I try to access iTunes (without external HDD attached) it asks me to either create an iTunes library or choose an existing one. I realize it's because my external is not hooked up, but once I get the new iMac and get my library working with it, should I just create a new library on my MacBook Pro? Also is it even possible to have one iTunes account on multiple computers?
Or would it be easier to hook up the external HDD to the airport extreme via USB and change the path on the new iMac? And that way both computers could access the external HDD, even though the USB connection would be a lot slower then the Firewire 800.
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Message was edited by: BillyJack

Use the external as you do now. Whenever necessary start iTunes with the option key held down so you can direct it to the correct library location on the external. Shouldn't be necessary to do this too often other than the first time, and maybe not even then if you successfully migrate all your settings from your old machine to the new first.

Newbie question about setting up iTunes to sync across multiple computers

Hi,
Right now I am using iTunes primarily for listening to streaming radio. However in about 2-3 weeks after I move, I am considering importing all my CDs into iTunes.
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Authorization only applies to computers. When you update a device any protected content on the device for which the library is not authorised will be removed. Otherwise no attempt is made to remove content that was added by a now deauthorised library.
There is a separate scheme permitting up to 10 devices (computers, iPhones, iPad or iPod touches) to be registered for automatic downloads of your purchases with a different mechanism for deregistering devices.
Once you have a file on your computer you can physically copy it to any other computer in the same way that you would copy any other file like a Word document, put it on a disk, email it if not too large, burn it to DVD, stick it on an external hard drive or move it over a network. You can use Get Info. To tell you where it is now and you can drop it into the library at the other end.
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Ken G. Rice wrote:
@gary0a1 - I assume you are referring to reply 20 by Jeff Wright from May 2012: "Yes you can have both computers turned on and connected at the same time. As long as you are only using the applications on one computer at a time it is not a violation of the EULA."
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Can I use the software I download from Creative Cloud on more than one machine?
Yes. Creative Cloud desktop applications can be downloaded and installed on multiple computers, regardless of operating system. However, activation is limited to two machines per individual associated with the membership. See the terms of use for more information. Learn how to deactivate a Creative Cloud license on a machine.
...what's more, the Creative Cloud EULA was updated on June 18, 2014, completely replacing the prior one from October 16, 2012. The new Adobe General Terms of Use reads:
"You may activate the Software on up to 2 devices (or virtual machines) at a time, if these activations are associated with the same Adobe ID for the same individual, unless stated at http://www.adobe.com/go/activation. However, you may not use the Software on these devices simultaneously." [emphasis added]
So, is using the CC apps on two systems at the same time actually allowed? Would it be possible to get a definitive answer or clarification on the previous reply here?
Thanks so much!

Simultaneous shutdown: halt of multiple computers possible via ARD 3.x?

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