The Ping core module is useful for notifying interested sites that your site has changed. It automatically sends notifications (called "pings") to the pingomatic service to tell it that your site has changed. In turn pingomatic will ping other services such as weblogs.com, Technorati, blo.gs, BlogRolling, Feedster.com, Moreover, etc.

The ping module requires cron or a similar periodic job scheduler to be enabled.

You can:

1. enable or disable the ping module at administer >> modules.
2. run your cron job at your site's cron page.
3. read about configuring cron jobs.

There are no configuration options, and hence no configuration interface.

An alternative is Feed Shark, for manual pings.

Another module that provides similar functionality is multiping.