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\documentclass{article}
\usepackage[designv]{web}
\usepackage{eforms}

%\previewOn\pmpvOn

\begin{defineJS}{\btnHashStrAct}
var resp=app.response({
  cQuestion: "Enter a PIN number",
  cTitle: "Get Hash String"
});
if (resp !=null) {
  var f=this.getField("txtHashStr");
  var hashStr=Collab.hashString(resp);
  f.value=hashStr;
  f=this.getField("txtPINNum");
  f.value=resp;
  f=this.getField("txtdeclPINId");
  f.value = "\\\\declPINId{"+resp+"}{"+hashStr+"}";
}
\end{defineJS}

\parindent0pt

\begin{document}

\section*{Get Hash String from PIN number}

\textbf{Extensive Instructions.} Create a four digit (PIN) number.
Push the button and enter the four digit number you just created into the response box.
When you press the  \textsf{OK} button,
the hash string of the PIN number you entered appears in the text field. The PIN number goes in as the
first argument of \verb|\declPINId|, and the hash string is the second argument of \verb|\declPINId|; eg,
\begin{verbatim}
\declPINId{5243}{02JRVZdRgYgCA-Rtje8VkD} % PIN number, hash string
\end{verbatim}

\textbf{Brief Instructions.} Press \textsf{Push}, enter your PIN, press \textsf{OK}.\medskip\par\noindent
\pushButton[\CA{Push}\AAmouseup{\btnHashStrAct}]{btn}{}{11bp}\olBdry
\textField[\textSize{8}]{txtHashStr}{2in}{11bp} Chosen PIN: \textField[\textSize{8}]{txtPINNum}{\widthof{00000}}{11bp}
\medskip\par\noindent
%
Save these two values as arguments of \verb|\declPINId| and place in the preamble of your
quiz document.\medskip

\noindent
Copy to quiz document: \textField[\textSize{8}]{txtdeclPINId}{3in}{13bp}\olBdry
\pushButton[\CA{Reset}\AAmouseup{this.resetForm();}]{reset}{}{13bp}



\end{document}