A solution to achieve remote cron jobs by regularly visiting web pages

I believe those who use Wordpress can probably guess the purpose of this article from the title. For scripting languages like PHP and ASP, if you want to regularly execute a certain task, such as automatically fetching RSS content or backing up databases, it's not possible to simply rely on the language itself to achieve this; instead, you need to leverage the Cron service in Linux. If your host is Linux and, fortunately, your host supports the cron function, then you don't need to worry about anything. However, what should you do if these two conditions are not met?