It seems you're asking about a plugin called "FourPlay" (sometimes stylized as Four-Play ) and its associated F4SE plugin.
: LL-fourplay requires specific frameworks to run: ll fourplay f4se plugin
In essence, the is a DLL-based extension that hooks directly into Fallout 4’s executable. It provides a bridge for mod authors to call native C++ functions from within Papyrus scripts, specifically functions related to animation control, actor positioning, and equipment stripping. It seems you're asking about a plugin called