For VBS & JScript the APIs are available through XNHost Object
LoadDll: used to load win32 dll either in XNeat process or in any window process
Struct: used to create win32 struct
Call: used to call win32 API in XNeat process space.
GetLastError: get the value returned by GetLastError API for the last called API.
CreateObject: used to create COM object, bypass some of Vista restrictions.
Sleep: same as WScript.Sleep.
Echo: same as WScript.Echo.
Resize[ HTML Only ]: resize the HTML window.
OpenPage[ HTML Only ]: open a new window.
Window[ HTML Only ]: get a handle to the main window.
For HTA & HTML the APIs are available through window.external Object