Use of "T"

[solidstate1991 via Digitalmars-d-learn]

Some utilities of my game engine needs a two-way "dictionary", 
mainly for increasing the readability of configuration files, but 
I was thinking on letting the end-user to use it for certain 
things and I don't want to recreate the encode/decode/load from 
SDLang file functions every time I have to use a similar thing. 
Currently I need to use it for int<->string conversion only (key 
names, button names, axis names, etc.), in the future I might use 
it for even more purpose (language files are planned to use XML 
due to the possibility of using UTF16, as the engine's native 
character handling is using it, not to mention the easier 
formatting via markup).

How can I make use of T? I've seen it being used many times for 
this application.