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Consider the case where many English words appear in a Gujarati language text. Each time an English word appears, the operator has to choose the English font of appropriate shape and size, and after typing the word, he has to change font again to Gujarati. This not only makes the data entry slow, but also increases errors in the entry.
The text on a page looks uniform and English words don't stand out, as the English font of matching shape, size and thickness is used.
You must have seen examples like this in printed output :
What has happened here is as following: when you selectively change fonts of a particular area in the text, a special hidden code indicating the change of fonts is inserted in the text. If for some technical reason, that code is erased, the font for that word is changed to Indian language font. And hence the garbage.
When many English words appear in a paragraph of Gujarati text, the printer has to work that extra hard and has to keep changing back and forth, between fonts. And obviously the print out takes that much longer. Using bilingual fonts not only makes printing faster, but also makes the print files smaller because there are less fonts to send to the printer.
Consider a case where you have to type text which uses many English words along with the Indian language. For example a text book of Maths or Science for a vernacular medium school.
If you are a web developer and have attempted to design web pages in Indian languages, you would appreciate this more. Consider an editor where you can change the font of the entire editor window, but not of individually selected text. (For example font page editor, or Text Pad or Ultre Edit.) Here if you set the fonts to bilingual Indian language font, the HTML codes and scripts will appear in English, while the text in Indian language will actually appear in that language.
