Quote:
I can't get hijack to popup messages. I've copied and pasted Mark's commands but it doesn't work. What else might need doing to enable this?

echo 'popup 5 Test Message' > /proc/empeg_notify

or in a c program, open() /proc/empeg_notify and use write() to write "popup x message" to it.

Quote:
Is there any way to display a graphic on the empeg's display, i.e. just from the command line?

Not unless you write your own program to do this.
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Mark Cushman