yui2Update = function(tnt, yui2, config) {
            var root = TNT + '.' +
                    (tnt || TNT_VERSION) + '/' +
                    (yui2 || YUI2_VERSION) + BUILD,
                base = (config && config.base) ? config.base : CDN_BASE,
                combo = (config && config.comboBase) ? config.comboBase : COMBO_BASE;

            groups.yui2.base = base + root;
            groups.yui2.root = root;
            groups.yui2.comboBase = combo;
        }
The YUI loader core
@module loader
@submodule loader-base