Not really aware of maps that utilize this
Basically a kick operated door.
This also exists in the retail (try kicking a door in E1L3 main hub for instance), possibly a remnant from an era where duke was to be able to kick doors open.
It's also possible to trigger SE with this as it can be linked to activator or MS sprites.
Just link the wall tag of the surface you kick with A or D and you are good to go. Although you might want to add a dummy L in to prevent regular use.
I also think that it requires the surface to have a texture that has a door attribute in it..
Possible scenario: Malfunctioning door that needs a bit of an extra kick to work, either to open or a scenario where a bunch of enemies are chasing you and a door refuses to close without some manual operation.
Or with SE, only the imagination is the limitation. All the possible things that only Duke's kick could activate
![:)](https://forums.duke4.net/public/style_emoticons/default/teehee.gif)