How to choose different styles of numerals in applications which support advanced OpenType typographic layout features.

The difference between TPTQ Arabic's AR and AR+LT fonts is that AR fonts do not include Latin characters. AR+LT fonts support Western European Latin-based languages

Comprehensive table of OpenType feature tags and their support in applications (software). OpenType features are created by using the tags in creating feature scripts that describe how characters are to be manipulated to make the desired feature.

TPTQ Arabic offers Multilingual Unicode Compliant Fonts in WGL4, and larger character sset supporting over 80 languages in standard Latin, Central European, Baltic, Turkish, Greek, Cyrillic, and Arabic encodings.