What's the best method to return a filtered grid to the server?

[AmitM]

How can I return a store that has been filtered? I need to be able to store which rows the user was currently looking at. My filter function is the one used on the examples site.

            var applyFilter = function (field) {
                //alert('applyFilter');
                if(field){
                    var id = field.id,
                        task = new Ext.util.DelayedTask(function(){
                            var f = Ext.getCmp(id);
                            f.focus();
                            f.el.dom.value = f.el.dom.value;
                        });
                    task.delay(100);
                }
                //alert(#{TestFilter}.getValue());
                //#{GridPanel1}.getStore().filter('Race', #{TestFilter}.getValue()); 
                #{GridPanel1}.getStore().filterBy(getRecordFilter());                                
            };

There is also a pagingtoolbar in play, so the store does not see all the records at one time. How can I return all the records (minus the filtered ones) to the server?