BIBINPUTS
Extra paths to locate
.bib
files.BSTINPUTS
Extra paths to locate
.bst
files.MFINPUTS
Extra paths to locate METAFONT input and openin files.
MIKTEX_REPOSITORY
Location of the default package repository. This can be either a fully qualified path name (a local package repository) or an URL (a remote package repository).
MIKTEX_TRACE
Comma-separated list of trace stream names (see Chapter 9, Trace Streams). If this variable is set, then MiKTeX programs will write trace messages into the configured log sink.
MFINPUTS
Extra paths to locate METAFONT input and openin files.
TEXINPUTS
Extra paths to locate TeX \input and \openin files.
TFMFONTS
Extra paths to locate TeX font metric files