Telugu is one of the few scripts where two incompatible ways of storing text are both still in daily use. Unicode gives every character a permanent code point that travels with the text. Anu Script and the other legacy systems store ASCII byte values whose meaning depends entirely on which font is applied. A newspaper page laid out in PageMaker and the same words on a website are, at the byte level, unrelated files.
Everything here is written for people who have to move text across that line — DTP operators, publishers, and anyone who opened an old Telugu document and found symbols instead of words. The guides explain the encoding itself; the converter and the 684-form mapping table do the actual work.