Tray Prodder is a Windows Explorer tool that adds two features that have been introduced in Windows Vista to previous versions of Windows. The two features in question are the ability to display checkboxes and to highlight the full row on select. The software program relies on the Microsoft .net Framework 3.5 SP1 which has to be installed prior to running the software program. The software itself does not have to be installed. It will display a small interface on startup that provides the means to activate the two features.
Both features are disabled by default and the user has to check the corresponding boxes to activate them. The changes become visible immediately in Windows Explorer. The checkboxes will be visible in every view mode available while highlighting the rows will only have a (visible) effect in Details view.

The Tray Prodder interface comes with additional buttons that can be used to select, check or clear the current items in Windows Explorer.

Users who have to work with Windows Explorer regularly might like Tray Prodder. Everyone else will probably not see a reason to have it running in the background all the time as it uses about 10 Megabytes of computer memory while running in the system tray.
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It’s a little more versatile than CTRL+Click or shift+Click I imagine but as someone who’s old school I couldn’t justify the memory usage.
This would be great if 1) It didn’t use 8MB of RAM when running, and 2) didn’t need the bloated .NET framework.
KDE introduced the checkmarks in the filemanager with KDE 4.0, with was released just one year ago. The 4.2 implementation (coming out this month!) is downright amazing, it makes handling large amounts of files so simple.
This would have been perfect if there was an option to automatically select the files as you checkmark them. Having to bring up the program from the tray in order to “Select all checked” is an extra step that hardly makes things easier. Close but no cigar.
@todd: That is what KDE does.