The main reason behind the separations of scripts into separate font files relates to disk image size contains and, to a less extent, the performance overhead loading a font that contains all of the worldwide glyphs. However, no single font contains all of these writing systems most contain a single script and the basic Latin characters. Starting with Windows Vista, the Windows core fonts contain support for most of the world’s writing systems including Latin, Hebrew, Arabic, Greek, Cyrillic, Thai, and each of the East Asian scripts. A common implementation for this would alternatives for preferred stylistic differences based on culture but it can also address complex issues such as the five character variants in the Cyrillic alphabet only used in the italic form. Layout features within OpenType fonts are organized by scripts (writing systems) and languages, allowing a single font to support multiple language variants, even within the writing system.

OpenType fonts can also include information that supports two-dimensional glyph positioning and glyph attachment, and can contain either TrueType or PostScript outlines. TrueType and OpenType fonts allow rich mapping between individual Unicode points and multiple glyphs, thus enabling support for ligatures, positional forms, alternates, and other substitutions. The OpenType font format has been developed jointly by Microsoft and Adobe it extends the TrueType font file format originally designed by Apple and Microsoft. In additional, advances in font formats allow for more elegant solutions across writing systems. Therefore, in addition to the font association technique used since the early versions of Windows, new features-font fallback, and font linking-were introduced to solve these types of font-selection problems.

This type of font selection would impose a big productivity overhead.

Simple applications such as Notepad.exe only allow one font for the whole document.

The average user might not know which font is the most suitable choice.

In addition to support for character coverage, when editing a multilingual document, the user has an expectation that they would not need to select a different font for each one of the scripts he or she wants to view because: For most operating systems, this is elegantly handled though mobile devices may have restricted writing system coverage based on market release.

A critical requirement for any operating system that supports for international writing systems is the ability to enter, select, and display the right character.

Windows mobile hebrew font