exporting display like

[mick crane <mick.crane@gmail.com>]

please bear in mind I don't know what I'm doing.
It is convenient to have the one display and keyboard/mouse
I sometimes if on windows use putty/Xming to start GUI program on other 
Debian PC.
Think I used screen before so can attach/detach from running terminal 
program but with X display program is it possible to first export to 
other machine then detach and come back to it later on other machine ?
There was VNC, is that the way to do that ?

mick
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