SVN = Subversion for short.
It is basically a sure fire way to keep track of different revisions and edits among a large programming group on a particular software. It allows you to make changes to a group project and later be able to go back and review where you made those changes and backup to that revision. That is what it was made for. There are also many other perks that you will discover while fooling around with it.
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The link above is a great place to test this tool out.
NOTE:
I wouldn't download that file from the above user Cabalmain_work is a potential virus/worm and the guy has 1 post... Don't be foolish.
Antivirus Version Last Update Result
AhnLab-V3 2008.5.2.1 2008.05.02 -
AntiVir 7.8.0.11 2008.05.02 PCK/Dumped
Authentium 4.93.8 2008.05.02 -
Avast 4.8.1169.0 2008.05.02 -
AVG 7.5.0.516 2008.05.01 -
BitDefender 7.2 2008.05.02 -
CAT-QuickHeal 9.50 2008.05.01 -
ClamAV 0.92.1 2008.05.02 -
DrWeb 4.44.0.09170 2008.04.30 -
eSafe 7.0.15.0 2008.04.28 -
eTrust-Vet 31.3.5752 2008.05.02 -
Ewido 4.0 2008.05.01 -
F-Prot 4.4.2.54 2008.05.01 W32/Downloader.H.gen!********
F-Secure 6.70.13260.0 2008.05.02 -
Fortinet 3.14.0.0 2008.05.02 -
Ikarus T3.1.1.26 2008.05.02 DroppedWin32.Worm.Stration.EM
Kaspersky 7.0.0.125 2008.05.02 -
McAfee 5285 2008.04.30 -
Microsoft 1.3408 2008.04.22 -
NOD32v2 3069 2008.05.01 -
Norman 5.80.02 2008.04.30 -
Panda 9.0.0.4 2008.05.01 Suspicious file
Prevx1 V2 2008.05.02 Heuristic: Supicious Worm With Mass Email Capabilities
Rising 20.42.22.00 2008.04.30 -
Sophos 4.29.0 2008.05.02 -
Sunbelt 3.0.1097.0 2008.05.01 -
Symantec 10 2008.05.02 -
TheHacker 6.2.92.298 2008.04.30 -
VBA32 3.12.6.5 2008.05.01 -
VirusBuster 4.3.26:9 2008.05.01 -
Webwasher-Gateway 6.6.2 2008.05.02 Packer.Dumped