win.addServerFrame()
s = w.addServerFrame(num)
Creates a new serverFrame, adds it to the window, and returns a pointer
to it. Optionally, the num parameter will create as many
serverFrames as desired, add them to the window, and returns the
address of the first one. All serverFrames of a window are referenced
in the "serverFrames[]" array, an internal variable of each window.
Don't use "serverFrames[0]"; it is used by the default window functions
and targets its WebServer requests to the window's displayFrame.
ServerFrames added by "addServerFrame()" behave just like serverFrames
created with "new". They are treated as a group when the win method
"submit()" is called, and the leftmost button on the window turns red
until all submitted serverFrames of that window have returned.