This command exists since Tk 8.4 and sets or retrieves window-specific attributes. The command is different for each platform. I know the possible options for Windows98 and it seems there are no options to this command with Linux.

'''Windows (98) options''':

All options take a true/false value

''-toolwindow'' makes a window with a single close-button (which is smaller than usual) on the right of the title bar

''-topmost'' makes sure the window always stays on top of  all other windows

''-disabled'' makes it impossible to interact with the window and redraws the focus

Example retrieving the default values:
 % wm attributes .
 -disabled 0 -toolwindow 0 -topmost 0

[RS] confirms that this applies to Windows 2000 too.
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[Category GUI] | [Category Porting]