{"name":"background","info":"An expression that identifies a background by name, number, or id, using one of the following forms:<br><br>\n\n<code><pre>background <i>posInteger<\/i>\nbackground <i>text<\/i> -- name\n<i>ordinal<\/i> background\n<\/pre><\/code>For example:<br><br>\n\n<code><pre>background \"Index\"\nbackground 1\nfirst background\nlast background\n<\/pre><\/code>"}