Doesn't Apple SU know which Apple programs are on my MacBook Pro?

Same issue here with different application downloaded and installed from App Store though. It's really annoying. The only solution I found is actually install that dam'n app and update it, which is Trillian if it does matter. I searched the whole hard drive for any mention of Trillian in content and deleted all of them, didn't help. So any advice on this issue would be of much appreciation.

Thanks.

David Gelfand wrote:

I don't have and don't use this application.

But you do have the built in ARD client. that's why you get the notification

You can ignore the update; that's a feature available within the Software Update screen. Select the update, and use the Update > Ignore Update item in the Software Update menus.

As for the ARD client and related, AFAIK that's also associated with the screen sharing tool that's available via Finder, and (even if you're not using ARD) quite handy when you have more than one Mac around. In the left column of Finder, select the target system and (if the target system has enabled Screen Sharing in the Sharing preference panel of System Preferences) select Share Screen button. I've long ago pinned the Screen Sharing tool into the dock. It's a useful tool. FWIW.

Deleting pieces of OS X is not something I'd recommend.

You can't delete it. It's build into the OS