On thread #972864 i open a issue for the sys(2325).
Now i can close it.

This is a Documentation's bug

The SYS(2325,nWHandle) return the VFP's Whandle of the nWHandle's Client window.

? SYS(2326,_screen.HWnd),SYS(2325,SYS(2326,_screen.HWnd))
? SYS(2326,_vfp.hwnd)   ,SYS(2325,SYS(2326,_vfp.HWnd))

Then,
- the implementation is correct
- the Intellisense tooltip is correct
- the help is mistaken

Fabio