The initial viewer software was designed for NEC PC-9800 series using a palette of 16 colours to display the doll. Shortly after, an enhanced standard was put forward (General Specification 2 known as 'KiSS/GS2') which included support for VGA cards and 256 or multiple 16 colour palettes. This standard is still the basis of KiSS, but several additional specifications have been incorporated into viewers since then, in particular "French KiSS", generally called FKiSS, for controlling interactivity and animation and "Cherry KiSS" (i.e. CKiSS) for 32-bit "true" colour support.