Is Screen Sharing with multiple users possible?

I am trying to discuss some documents with multiple users. It works very well with just two users sharing the screen of one of them, so I was wondering if there was a way to have a third user participating. If iChat does not allow this, does anyone know a different software solution?
Thanks
Christian

Hi,
No. (Not in iChat)
And I have not heard of anything either.
10:39 PM Friday; October 22, 2010
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"

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Hi
Thank you for your answer. Sorry to have been unclear - I'll give it another go :o)
Here is what I am trying to do:
I have 2 users (Plex and Ursus) that I want to have logged on at the same time. Plex will be "in the front" i.e. that is the screen that is seen if you are at the mini. Ursus is a user that is logged on but you cannot currently see (i.e. in the back as it where). I would like to work using the user Ursus (to, for example, rip a movie from a DVD (that I own of course :o).
Using file sharing would mean that I have 2 machines running and that I need to copy all the files from the one machine to the other, not exactly what I want but manageable.
I have managed to get this "partly" working - I am using Vine Server for Mac (http://www.testplant.com/products/vineserver/OSX) which allows me to start a VNC server on e.g. port 5901 and then screen share to that session. If I setup the second user (Ursus in this case) to use this server then I can connect to the "back" user. The only problem being that Vine Server seems to crash with Plex - as soon as I start it Plex just hangs and randomly crashes!
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Greetings,
I have been troubleshooting a problem sharing iTunes on a single computer with multiple users that cropped up a few weeks ago and have not had very good luck.
Several months ago I successfully set up my wife’s G4 Laptop (PowerPC processor) so that we could share iTunes on that computer. I had just gotten her an “My Book” external hard drive (Western Digital). The iTunes Library will go on this new unit because the internal drive was running out of room. I successfully set the privileges, moved the entire library onto a “Share” directory and everything worked fine.
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Working on a single computer with multiple users, I have set things up to allow each user to view and listen to the others' music libraries under the "Shared Library" function. Can you then connect an iPod touch and copy music from a shared library?

Was your wife logged into the libray at the time you tried to log in? I have had a similar problem and it was because another user was logged into the library when I attempted to. I got the permission denied banner.

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After searching the web and the discussion here, here's my minimal impact solution for multiple Macs with multiple users in a household:
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5) Do the same for me on Mac2.
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I'm stuck for a while now with my iMac and parental controlled user accounts.
It's for a few months now iPhoto and Preview keep crashing at starting up in these other accounts.
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I think the problem started with connecting a photocamera (Sony W125) directly to the computer.
It seems that viewing pictures (PDF/iphoto) is corrupted in this way.
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removed plists
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Process:         iPhoto [1058]
Path: /Applications/iPhoto.app/Contents/MacOS/iPhoto
Identifier:      com.apple.iPhoto
Version:         9.4.2 (9.4.2)
Build Info:      iPhotoProject-710042000000000~2
Code Type:       X86 (Native)
Parent Process: launchd [807]
Date/Time:       2012-11-05 10:30:59.667 +0100
OS Version:      Mac OS X 10.7.5 (11G63)
Report Version: 9
Interval Since Last Report:          247 sec
Crashes Since Last Report:           2
Per-App Crashes Since Last Report:   1
Anonymous UUID: 19E6D82E-8DD9-4044-B141-C67D09268E1F
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes: 0x0000000000000001, 0x0000000000000000
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dyld: launch, running initializers
/usr/lib/libSystem.B.dylib
xpchelper reply message validation: code signature invalid
The code signature is not valid: The operation couldn’t be completed. (OSStatus error 100005.)
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code signature invalid
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libxpc.dylib                      0x96b2254e runtime_init + 2014
1 libdispatch.dylib                         0x92d10c27 dispatch_once_f + 50
2 libxpc.dylib                      0x96b22d92 _xpc_runtime_set_domain + 350
3 libxpc.dylib                      0x96b1f9af _libxpc_initializer + 578
4 libSystem.B.dylib                        0x94ba77a7 libSystem_initializer + 199
5 dyld                                  0x8fef1203 ImageLoaderMachO::doModInitFunctions(ImageLoader::LinkContext const&) + 251
6 dyld                                  0x8fef0d68 ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 64
7 dyld                                  0x8feee2c8 ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&) + 256
8 dyld                                  0x8feee25e ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&, unsigned int, ImageLoader::InitializerTimingList&) + 150

After searching the web and the discussion here, here's my minimal impact solution for multiple Macs with multiple users in a household:
1) Set up Mac1 for myself only
2) Set up Mac2 for the wife and kid
3) Set up each Mac to backup to the Airport base station using Time Machine (this would create two separate backups on the Airport base station's drive, which from what I've read has its own problems)
4) On Mac1 setup "empty user accounts" for the wife and kid. These will not have any files in them - just an access mechanism. If they want to access their files, they can use Time Machine's "The Browse Other Backup Disks Option" to get their file from Mac2, work on it and then drop it in the Shared Folder. Next time they are on Mac2, remember to copy the updated/created file from the Shared Folder into their Mac2 user account. If possible, get Time Machine to not backup the "empty user accounts".
5) Do the same for me on Mac2.
Not the most elegant solution, but until Apple get off their backside and make this seamless, I can't think of anything else :-( .
P.S. iCloud is not a soluton since it costs hundreds of dollars a year, uses up intenet data allowance and is slow.

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Is Screen Sharing with multiple users possible?

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