60 Chapter 4. Red Hat Network Websitetools for kickstarting machines, managing their configuration files, conducting snapshot rollbacks,and inputting searchable custom system information, as well as all of the functionality included inthe Management service level.The System Entitlements page allows you to view and promote the entitlements for your registeredsystems. Only increases in entitlement levels are allowed. Systems cannot be re-entitled to a lowerentitlement level. For instance, a system entitled to the Update service level can be promoted to theManagement level, but this action cannot be reversed.To change an individual entitlement, select the entitlement from the system’s pulldown menu andclick the Update Entitlements button on the bottom right-hand corner of the page. Click the name ofa system to see details about it. If no drop-down menu exists for your Update-level system, you mayneed to purchase a Management entitlement. Do this through the Buy Now page under Your RHN.WarningChanging a system’s entitlement is an irreversible action. You may be unable to change the entitle-ment levels of some systems. For more information, refer to the RHN entitlement policy linked fromthe System Entitlements page.In addition, you may entitle all newly registered systems to the Managements service level at onceby clicking the Auto-Entitle Newest Servers Now link at the bottom of the page. To use this link,which appears only when new, unentitled systems exist, first make sure you have enough Managemententitlements available. If you need to purchase additional entitlements, click the Buy them now linkat the top of the page. After auto-entitling, a message appears at the top of the System Entitlementspage indicating the number of systems successfully entitled to the Management service level.4.4.6. Advanced SearchThe System Search page allows you to search through your systems according to specific criteria.These criteria include custom system information, system details, hardware, devices, interface, net-working, packages, and location. The activity selections (Days Since Last Checkin, for instance) canbe especially useful in finding and removing outdated System Profiles. Type the keyword, select thecriterion to search by, use the radio buttons to identify whether you wish to query all systems or onlythose loaded in the System Set Manager, and click the Search button. Yo may also select the InvertResult checkbox to reverse your results list.The results appear at the bottom of the page. For details about using the resulting system list, refer toSection 4.4.2 Systems.4.4.7. Activation KeysRHN Management and Provisioning customers can generate activation keys through the RHN web-site. These keys can then be used to register the Red Hat Linux system, entitle the system to an RHNservice level and subscribe the system to specific channels and system groups through the commandline utility rhnreg_ks. Refer to Section 2.5 Registering with Activation Keys for instructions on use.NoteSystem-specific activation keys created through the Reactivation subtab of the System Details pagedo not show up in this list because they are not reusable across systems.