Warnings when running disk utility after downloads, etc.

I use Mc Janitor nightly to clear some of the 'stuff" that accumulates with files, etc. but run Disk Utility after downloads and such about once a month. I have done this since 2003 when I had my first e-mac. Only recently have "warnings " appear on the list of repair or varify disk...that says certain items can not be repaired. The techs at the Apple store said to just ignore them, which I have been doing. But the last download, which was a rather large new Security download, came up with something new, both on my computer and my husband's lap top when he downloaded it. These are letters that appear and say ACL found but not expected on Applications/Utilities, on "Applications" and on "Library."
We are just curious about what ACL is (or are) and what it means to have them in our systems.
It does say that the disk is verified when I run that. Everything seems to be working normally.

A few posts below yours is this one:
http://discussions.apple.com/thread.jspa?threadID=2310982&tstart=0
New Permissions messages after Security Update/more curious than concerned

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    In addition you may want to boot in the single user mode to access the FSCK command as follows: The following is from the Apple support site
    Mac OS X: How to Start up in Single-User or Verbose Mode
    You may use a key combination when starting up the computer to enter single-user mode or verbose mode, either of which can be used for troubleshooting and in software development. This document applies to Mac OS X and Mac OS X Server versions 10.0 and later.
    Steps to Enter Single-User or Verbose Mode
    1. Shut down the computer if it is on.
    2. Press the power button to start the computer.
    3. Immediately press and hold the Command (Apple) key and one of the following:
    the "s" key for single-user mode.
    the "v" key for verbose mode.
    4. To exit single-user mode type: reboot
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    Then you may try to repair as follows using the FSCK
    fsck is a command-line utility that may be able to verify and repair a disk. If you can successfully start up in Safe Mode or use Disk Utility while started up from a disc, you don't need to use fsck. However, here are some situations in which fsck may be necessary.
    Your Mac OS X disc isn't available.
    Your optical drive isn't available.
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    If you're not sure how your volume is formatted and you can't start up from your Mac OS X volume to find out, type the following command in a command-line interface and then press Return: diskutil info /
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    Note: If necessary, perform a forced restart as described in the Emergency Troubleshooting Handbook that came with your computer. On desktop computers, you can do this by pressing the reset/interrupt button (if there is one) or holding down the power button for several seconds. On portable computers, simultaneously press the Command-Control-power keys. If your portable computer doesn't restart with this method, you may need to reset the Power Manager.
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    *** FILE SYSTEM WAS MODIFIED ***
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    The -f flag: Forces fsck to check "clean" filesystems when preening.
    Macbook Pro 17" 7200 HD 1GB Powerbook G4 (15 inch FW 800)   Mac OS X (10.4.6)  
    Macbook Pro 17" 7200 HD 1GB Powerbook G4 (15 inch FW 800)   Mac OS X (10.4.6)  
    Macbook Pro 17" 7200 HD 1GB Powerbook G4 (15 inch FW 800)   Mac OS X (10.4.6)  

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