##
win.getReturnedVar()

    var v = w.getReturnedVar("name")

Retrieves the value of the named variable from the first form of the window's displayFrame. If the variable does not exist, returns null. Usually this form has been filled in by a WebServer request. Note that this method is not called "getVar()", as this would confuse people into thinking that it came from the same source where "setVar()" puts is values. Actually, "setVar()" assigns variables in the window's first serverFrame, and "getReturnedVar()" retrieves them from the window's displayFrame.
Note that a form element is always available in a frame returned by a WebServer, even if the server has not created one. In that case a form without any variables is added after the server request has returned. Every call to "getReturnedVar()" will return "null" in that case