User guide

this value will be defined as 3. If this value is larger than the highest preemption level of
the user, the value will be used as the effective user preemption level.
• Effective user preemption level - This is the largest value between the user and group
preemption level, and is the actual preemption level that will be recognized by the
DSView software when the user attempts to preempt another user’s session. For example, if
user belongs to the auditors group (level 1) but is assigned a user preemption level of 4, the
user will have an effective user preemption level of 4. Although a member of the auditors
group, this user would also be able to preempt the session of a user belonging to the
administrators or appliance administrators user groups.
An administrator or user administrator may also specify a local user interface preemption level
that is applied to users accessing target devices through the local interface. See KVM Switch
and Cascade Switch Settings on page 174.
Internet Explorer Considerations
When the Internet Explorer web browser is used, specific settings are required to enable the
DSView software to operate correctly.
• SSL (Secure Sockets Layer) certificates - Used for secure authentication between the
DSView software client and DSView software hub server; see Certificates on page 51.
• ActiveX controls - Used to display Telnet application, serial and KVM sessions.
• Security Zones - Used to control the actions that may be performed within Internet
Explorer. For example, the operation of JavaScript, which is used by the DSView software,
is dependent on security zone settings.
• Advanced Internet options - Used for miscellaneous settings that enhance the use of the
DSView software.
Managing ActiveX
®
controls
The DSView software uses ActiveX controls to provide interactive content for viewers. (The
Avocent Telnet Viewer uses Java; see Java Installation on page 22 for information.)
The functionality of the ActiveX controls is determined by the settings for the security zone
being used by the DSView software. See Security zones on page 48.
Administrators may prevent users from installing software on their computers. In this case, the
Windows domain administrators may choose to “push” an MSI installer using a Group Policy.
This will silently install the Avocent Session Viewers without requiring the user to install the
software themselves. This will install only the viewers for Internet Explorer. The MSI file is
located in the webapp/applets directory on the DSView server.
46 DSView™ 4 Installer/User Guide