function _fnAjaxParameters( settings )
	{
		var
			columns = settings.aoColumns,
			columnCount = columns.length,
			features = settings.oFeatures,
			preSearch = settings.oPreviousSearch,
			preColSearch = settings.aoPreSearchCols,
			i, data = [], dataProp, column, columnSearch,
			sort = _fnSortFlatten( settings ),
			displayStart = settings._iDisplayStart,
			displayLength = features.bPaginate !== false ?
				settings._iDisplayLength :
				-1;
	
		var param = function ( name, value ) {
			data.push( { 'name': name, 'value': value } );
		};
	
		// DataTables 1.9- compatible method
		param( 'sEcho',          settings.iDraw );
		param( 'iColumns',       columnCount );
		param( 'sColumns',       _pluck( columns, 'sName' ).join(',') );
		param( 'iDisplayStart',  displayStart );
		param( 'iDisplayLength', displayLength );
	
		// DataTables 1.10+ method
		var d = {
			draw:    settings.iDraw,
			columns: [],
			order:   [],
			start:   displayStart,
			length:  displayLength,
			search:  {
				value: preSearch.sSearch,
				regex: preSearch.bRegex
			}
		};
	
		for ( i=0 ; i<columnCount ; i++ ) {
			column = columns[i];
			columnSearch = preColSearch[i];
			dataProp = typeof column.mData=="function" ? 'function' : column.mData ;
	
			d.columns.push( {
				data:       dataProp,
				name:       column.sName,
				searchable: column.bSearchable,
				orderable:  column.bSortable,
				search:     {
					value: columnSearch.sSearch,
					regex: columnSearch.bRegex
				}
			} );
	
			param( "mDataProp_"+i, dataProp );
	
			if ( features.bFilter ) {
				param( 'sSearch_'+i,     columnSearch.sSearch );
				param( 'bRegex_'+i,      columnSearch.bRegex );
				param( 'bSearchable_'+i, column.bSearchable );
			}
	
			if ( features.bSort ) {
				param( 'bSortable_'+i, column.bSortable );
			}
		}
	
		if ( features.bFilter ) {
			param( 'sSearch', preSearch.sSearch );
			param( 'bRegex', preSearch.bRegex );
		}
	
		if ( features.bSort ) {
			$.each( sort, function ( i, val ) {
				d.order.push( { column: val.col, dir: val.dir } );
	
				param( 'iSortCol_'+i, val.col );
				param( 'sSortDir_'+i, val.dir );
			} );
	
			param( 'iSortingCols', sort.length );
		}
	
		// If the legacy.ajax parameter is null, then we automatically decide which
		// form to use, based on sAjaxSource
		var legacy = DataTable.ext.legacy.ajax;
		if ( legacy === null ) {
			return settings.sAjaxSource ? data : d;
		}
	
		// Otherwise, if legacy has been specified then we use that to decide on the
		// form
		return legacy ? data : d;
	}
Build up the parameters in an object needed for a server-side processing
request. Note that this is basically done twice, is different ways - a modern
method which is used by default in DataTables 1.10 which uses objects and
arrays, or the 1.9- method with is name / value pairs. 1.9 method is used if
the sAjaxSource option is used in the initialisation, or the legacyAjax
option is set.
 @param {object} oSettings dataTables settings object
 @returns {bool} block the table drawing or not
 @memberof DataTable#oApi