... where $NSCDE_FONT_DPI is by default hardcoded to 96.
This files are real files in system-wide configuration, or symbolic links to some fontset in
$FVWM_USERDIR
when generated by Font Style
Manager.
Font sizes in configs are defined as infostore variables and used across FVWM config files, an provided to FvwmScript programs with getfont wrapper. Font sizes are in points. While defining them in pixels (pixelsize=) will be easier, and all this care about DPI will not be needed, integration with GTK2 and GTK3 in best of my knowledge and research does not provide a way to define fonts in pixel sizes, so either font sizes in points or unsure recalculation (again based on DPI) will be needed while writing gtk settings.