display-multi - Duplicate visual operations onto multiple visuals
display-multi <:targetspec> ...
Duplicates all drawing operations onto multiple child targets, thus
producing identical output on multiple visuals.
The argument to display-multi is a colon- (:) separated list of target
specs to draw on. Because target specs can (and often do) contain
colons, they need to be enclosed in parentheses.
Specifies the target which to draw on (the parent target). This
defaults to automatic selection (just like using ggiOpen(NULL)
when GGI_DISPLAY is not set).
· DirectBuffer never supported.