[host] update information about PsExec now LG can run as a service

host/README.md

@@ -65,6 +65,26 @@ Or if running as a system service it will be located in:
 You can find out where the file is by right clicking on the tray icon and
 selecting "Log File Location"
 
+### High priority capture using DXGI and Secure Desktop (UAC) capture support
+
+By default Windows gives priority to the foreground application for any GPU
+work which causes issues with capture if the foreground application is consuming
+100% of the available GPU resources. The looking glass host application is able
+to increase the kernel GPU thread to realtime priority which fixes this, but in
+order to do so it must run as the `SYSTEM` user account. To do this, Looking
+Glass needs to run as a service. This can be accomplished by either using the
+NSIS installer which will do this for you, or you can use the following command
+to Install the service manually:
+
+    looking-glass-host.exe InstallService
+
+To remove the service use the following command:
+
+    looking-glass-host.exe UninstallService
+
+This will also enable the host application to capture the secure desktop which
+includes things like the lock screen and UAC prompts.
+
 ## Why does this version require Administrator privileges
 
 This is intentional for several reasons.