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<refentry id="button">
<indexterm id="IndexButton"><primary>button</primary></indexterm>
<refentryinfo><title>Instrument Control:Sensing and Control</title></refentryinfo>
<refmeta>
<refentrytitle>button</refentrytitle>
</refmeta>
<refnamediv>
<refname>button</refname>
<refpurpose>
Sense on-screen controls.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Sense on-screen controls. Requires Winsound or TCL/TK.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis>kres <command>button</command> knum</synopsis>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
<emphasis>kres</emphasis> -- value of the button control. If the button has been pushed since the last k-period, then return 1, otherwise return 0.
</para>
<para>
<emphasis>knum</emphasis> -- the number of the button. If it does not exist, it is made on-screen at initialization.
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="checkbox"><citetitle>checkbox</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>
<simplelist>
<member>Author: &namejohn;</member>
<member>University of Bath, Codemist. Ltd.</member>
<member>Bath, UK</member>
<member>September 2000</member>
</simplelist>
</para>
<para>New in Csound version 4.08</para>
</refsect1>
</refentry>
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