Disable alt tab window switching in Gnome 2

How do I disable the alt+tab switching between Gnome 2 windows? Which part of Gnome is responsible for doing the alt+tab ? metacity ? I am using Gnome 2.16.0 (RHEL5). I do not see any keyboard shortcut for alt+tab, when listing the configuration database: $ gconftool-2 -R / | egrep -i alt mouse_button_modifier = switch_to_workspace_down = Down switch_to_workspace_left = Left switch_to_workspace_up = Up switch_to_workspace_right = Right move_to_workspace_up = Up maximize = F10 unmaximize = F5 minimize = F9 begin_move = F7 move_to_workspace_down = Down move_to_workspace_right = Right move_to_workspace_left = Left begin_resize = F8 On the web there are some questions relating to alt+tab and Gnome 3, but nothing about completely disabling alt+tab in Gnome 3. Background: I am running linux in a RealVNC window on a Windows10 pc, and would like alt+tab to switch between my Windows10 windows, and not between Gnome windows.