Chapter 4. Red Hat Network Website 57information.) Clicking the Affected Systems number lists all of the systems addressed by the Errata.To apply the Errata Updates in this list, select the systems and click the Apply Errata button.• Admins — List of all organization users that potentially have permission to manage the systemgroup. Organization Administrators are clearly identified. To change the system group’s users, se-lect and unselect the appropriate checkboxes and click the Update button.4.4.4. System Set ManagerThe System Set Manager allows you to perform many actions possible individually through theSystem Details page on multiple systems at once, including:• Apply Errata updates• Upgrade packages to the most recent versions available• Add/remove systems to/from system groups• Subscribe/unsubscribe systems to/from channels• Update system profiles• Modify system preferences such as scheduled download and installation of packages• Kickstart or re-install entire several Provisioning-entitled systems at once• Set the subscription and rank of configuration channels for Provisioning-entitled systems• Tag the most recent snapshots of your selected Provisioning-entitled systems• Revert Provisioning-entitled systems to previous snapshots• Run remote commands on Provisioning-entitled systems through the RHN websiteBefore performing actions on multiple systems, you must select systems you wish to modify. Note thatUpdate-level systems cannot be selected. Pages including Systems list, System Search, and SystemGroups list have a column of checkboxes under the Select heading. Mark the checkboxes beside thesystems or groups you want to select, and click the Update List button below the column to add themto the System Set Manager.You can access the System Set Manager page in two ways: 1)Add systems and groups from theirrespective lists to the System Set Manager and click System Set Manager in the left navigation bar.2)Click Use Group in the System Groups list or Work with Group on the System Group Detailspage to work with a predefined system group.The System Set Manager page contains a set of tabs:• Overview — Description of the various options available to you in the remaining tabs.• Systems — List of systems now selected. To delete systems from this particular set, select themand click the Remove button.• Errata — List of Errata Updates applicable to the current system set. To apply updates, select theErrata and click the Apply Errata button.• Packages — Options to modify packages on the system set:• Install new packages — Clicking this link takes you to a list of channels from which you mayretrieve packages. Click on the channel name and select the packages from the list. Then clickthe Install Packages button.• Upgrade existing packages — Clicking this link takes you to a list of all the packages installedon the selected systems. Select the packages to be upgraded, then click the Upgrade Packagesbutton.