Defining "dummy" monitor

Dennis at
Thu Dec 31 19:28:37 PST 2015

Is there any way that I can define a dummy monitor for "X"?

I have several remote PCs w/Debian-Jessie and very low-res 
monitors that I would like to be able to access via vnc from 
my desktop and use a hi-res interface to match my desktop 

TIA for any help or suggestions,

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