My OTF fonts use Contextual Alternates just fine, but TTF fonts cannot display Contextual Alternates or Stylistic Sets. I understand the <--languagesystem latn dflt;--> tag requires a digital signature for these shapes. Microsoft's website is comprehensive in its instructions for signing, but instructions are only for Windows users.
Can DISG be done on Macintosh with FontLab 5.04 (I know 5.1 has an issue with disg)? If this cannot be done on Mac, does it mean I need to purchase FontLab for Windows just to make signed fonts!