SAP offers a wide range of add-ons that you can use to enhance your standard SAP system. These add-ons can be Industry Solutions, plug-ins or customer-specific development projects. The SAP Add-On Installation Tool (transaction SAINT) was developed to allow users to install and upgrade add-ons directly from their standard SAP system. If necessary, you can also use this tool to uninstall ABAP Add-Ons. However, this function is only available for Add-Ons that are explicitly intended to be removed, and that are marked as removable. It is not necessary to access the operating system or to reboot the system. SAP offers preconfigured systems (PCS or SAP Best Practices) that can also be installed using the SAP Add-On Installation Tool. A PCS reduces the amount of work required to install and customize an industry-specific solución.