x-create-frame

x-create-frame is a built-in function in `C source code'.

(x-create-frame PARMS)

Make a new X window, which is called a "frame" in Emacs terms.
Return an Emacs frame object. PARMS is an alist of frame parameters.
If the parameters specify that the frame should not have a minibuffer,
and do not specify a specific minibuffer window to use, then
`default-minibuffer-frame' must be a frame whose minibuffer can be
shared by the new frame.

This function is an internal primitive--use `make-frame' instead.