[doc] readme updated with PsExec information

VERSION

@@ -1 +1 @@
-B2-rc2-32-g3302d353cf+1
+B2-rc2-33-g2e1b0f2550+1

client/README.md

@@ -35,6 +35,23 @@ Should this all go well you should be left with the file `looking-glass-client`
 
 ## Usage Tips
 
+### 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, please use
+`PsExec` from SysInternals (Microsoft), for example:
+
+    PsExec64.exe -s -i -d looking-glass-host.exe
+
+This will also enable the host application to capture the secure desktop which
+includes things like the lock screen and UAC prompts.
+
+A future update (likely Beta 3) will include a service launcher for the Looking
+Glass host which will remove the need for `PsExec`.
+
 ### Key Bindings
 
 By default Looking Glass uses the `Scroll Lock` key as the escape key for commands as well as the input capture mode toggle, this can be changed using the `-m` switch if you desire a different key.