/litemage/admin/purge?tags= - This command is used to purge any page containing a certain item, category, or cms page by ID number. The command should be followed by a comma separated list of tags and ID numbers where the tag can be P(for product), C(for catalog), or G(for cms page), followed by a dot and the desired numeric ID.
For Example: your_site_url/litemage/admin/purge?tags=P.345,C.4,G.1
This is very useful in cases where your Magento database is updated by an external program. In these cases you can use GET with this parameter in a script to automate purging the affected products, categories, or cms pages.
Note: This is not necessary if updating only through the Magento Admin Panel. When a product is saved in the Magento Admin Panel, not only the product page but also all the related category pages will be automatically purged.