If you want to prevent opening of PDF documents within the browser you can do this manually on each machine by opening Internet Explorer | Settings | Manage add-ons

As you can see Adobe PDF add-on is not visible, not even if you select to show all add-ons

Therefore, in the left pane under Show select 'Run without permission'

Select Adobe Reader and click Disable.

Some of our portable users experienced IP Address conflict when resuming their machines from sleep mode.

An IP address conflict occurs when two computers on a LAN (local area network) or the Internet have been assigned the same IP address. IP conflicts usually render either one or both of computers unusable for network operations.

To avoid this situation you can extend the lease for the Scope or use a DHCP reservations.

If above suggested is not acceptible for you, there is also another way to fix DHCP address conflicts by creating a simple batch file that will renew IP address automatically in the case of IP conflict.

If you have the need to remove the Action Center icon from Notification area or system tray (old name) then please do the following:

Open local policy (gpedit.msc)

Navigate to:

User Configuration | Administrative Templates | Start Menu and Taskbar

In the right pane double click on the 'Remove the Action Center icon' and select Enable to remove the icon from the Notification Area or System Tray.

To show or hide all icons in the notification area please do the following:

Open Registry Editor (regedit)

Navigate to:

HKEY_CURRENT_USER | Software | Microsoft | Windows | CurrentVersion | Explorer 

or

HKEY_LOCAL_MACHINE | Software | Microsoft | Windows | CurrentVersion | Explorer

Create the following DWORD 32-bit key:

EnableAutoTray

Set the value of the key to 0 if you want to hide all notification area icons or set the value to 1 if you want to hide all of the notification area icons.