— Function: frame-parameter frame parameter

This function returns the value of the parameter named parameter of frame. If frame is nil, it returns the selected frame's parameter.

— Function: frame-parameters frame

The function frame-parameters returns an alist listing all the parameters of frame and their values.

— Function: modify-frame-parameters frame alist

This function alters the parameters of frame frame based on the elements of alist. Each element of alist has the form (parm . value), where parm is a symbol naming a parameter. If you don't mention a parameter in alist, its value doesn't change.