Users can select new font encodings using the fontenc package. The
fontenc package has options for encodings; the last option becomes
the default encoding. For example, to use the OT2 (Washington
University Cyrillic encoding) and T1 encodings, with T1 as the
default, an author types:
\usepackage[OT2,T1]{fontenc}
This package loads the encoding definition files
(<ENC>enc.def files) for each font encoding <ENC> given as an
option but not already declared; it also sets \encodingdefault to be
the last encoding in the option list.
LaTeX currently predefines the OT1 and T1 text encodings, and
provides the files OT1enc.def and T1enc.def. Other encoding
set-ups might be added to the distribution at a later stage.
Thus the example above loads the file OT2enc.def and sets
\encodingdefault to T1.
Note: If you wish to use T1-encoded fonts other than the `cmr' family then you may need to load the package (e.g. times) that selects the fonts before loading fontenc (this prevents the system from attempting to load any T1-encoded fonts from the `cmr' family).