[doc] readme updated with PsExec information

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Geoffrey McRae 2020-08-09 20:11:19 +10:00
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## 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.