wp-admin\includes\template.php
1805:                           x.open('GET', ajaxurl + '?action=wp-compression-test&test='+test+'&'+(new Date()).getTime(), true);

wp-admin\js\dashboard.js
42:                                     p.load( ajaxurl + '?action=dashboard-widgets&widget=' + id + '&pagenow=' + pagenow, '', function() {

wp-admin\js\image-edit.js
198:                    .attr('src', ajaxurl + '?' + $.param(data));

wp-admin\js\inline-edit-post.js
114:                    $('tr.inline-editor textarea[name="tax_input['+tax+']"]').suggest( ajaxurl + '?action=ajax-tag-search&tax=' + tax, { delay: 500, minchars: 2, multiple: true, multipleSep: inlineEditL10n.comma } );
203:                    textarea.suggest( ajaxurl + '?action=ajax-tag-search&tax=' + taxname, { delay: 500, minchars: 2, multiple: true, multipleSep: inlineEditL10n.comma } );

wp-admin\js\tags-box.js
179:                                    ajaxurl + '?action=ajax-tag-search&tax=' + tax,

wp-admin\js\user-suggest.js
17:                             source:    ajaxurl + '?action=autocomplete-user&autocomplete_type=' + autocompleteType + '&autocomplete_field=' + autocompleteField + id,

wp-content\themes\twentyfourteen\js\featured-content-admin.js
8:      $( '#customize-control-featured-content-tag-name input' ).suggest( ajaxurl + '?action=ajax-tag-search&tax=post_tag', { delay: 500, minchars: 2 } );