Magento Caching

const CACHE_TAG_NAMESPACE_MODULE = "YOUR_MODULES_CACHE_TAGS";
$cacheGroup = 'namespace_module';
$useCache = Mage::app()->useCache($cacheGroup);
if (true === $useCache) {    
    $cacheId = 'unique_name';
    if ($cacheContent = Mage::app()->loadCache($cacheId)) {
        $html = $cacheContent;
        return $html;
    } else {
        try {
            $cacheContent = $html;
            $tags = array(model::CACHE_TAG_NAMESPACE_MODULE);
            $lifetime = Mage::getStoreConfig('core/cache/lifetime');
            Mage::app()->saveCache($cacheContent, $cacheId, $tags, $lifetime);
        } catch (Exception $e) {
            // Exception = no caching
            Mage::logException($e);
        }
        return $html;
   }
}
// Default:
return $html;

Mage::app()->removeCache($cacheId); 

Mage::app()->cleanCache()

Mage::app()->getCacheInstance()->flush();