Security breach? Unknown shared icon appearing

Not sure what is going on here. I have an iMac and a MacBook Pro along with two old PCs on a network. My MacBook pro uses the network/Internet by wireless. Everything else is hardwired.
My MacBook Pro is showing an icon in my Shared category in finder that I can't ID. It is listed as "mac0022412b087e" and it is a PC icon, not a Mac icon. It says I am logged into it (or it is logged into me) as a guest. I also see my iMac there. I have all sharing on MacBook Pro disabled and the firewall is on with only selected applications having access. All are apps I recognize and know need network/Internet access.
If I disconnect my cable modem the icon still appears. Only if I turn the airport off completely does it go away. I can't figure out what or who this is or where it is coming from. Virus scans come back negative on the system. Any ideas of finding out what, who this is, where it is coming from?
Thanks.
Matt

?-Does any of the hardwierd machines have a airport/wireless card instaled. If they do, is the icon still present if you turn it off.
-sounds like a bonjour machine to be honest
?-what IP does that machine get if you run "arp -a" from the Terminal
-check the MAC address from that command against the MAC address of you wireless cards on the other machines
Best o´luck

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For the points
You emailed me this post as well. One Method will do.
Copy of email for other readers
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We are talking about the app tucked away in the Hard Drive/System/Library/Core Services folder ?
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2. Clicking on the Details menu, the screen sharing icon was available for both of us. It was not grayed out.
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1. Create new Apps User DISC_INQUIRY_USER, assign it Inquiry-Only Responsbilities
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3. Login to User Edition - DISC_INQUIRY_USER: Projects Inquiry-Only User
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Issue
There is time-gap between creating Apps User and login to Discoverer Admin to remove user privileges. This is security Breach, is their any way to change get around it.
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- I am facing this issue in Discoverer 4.1.48, Does discoverer Admin behaves differently in latest Versions?

Nobody helps you except yourself. ;)
So, this query get privileges for user PUBLIC
select eap.ap_id, eap.gp_app_id
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where eeu.eu_username = 'PUBLIC'
and eap.ap_eu_id = eeu.eu_id
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In my case
3001     1000
3002     1001
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3017     1018
3018     1024
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1018     Unknown
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This is a REAL BUG!!!
Then I executed query
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Security breach? Unknown shared icon appearing

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