BIBINPUTSExtra paths to locate .bib files.
BSTINPUTSExtra paths to locate .bst files.
MFINPUTSExtra paths to locate METAFONT input and openin files.
MIKTEX_REPOSITORYLocation 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_TRACEComma-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.
MFINPUTSExtra paths to locate METAFONT input and openin files.
TEXINPUTSExtra paths to locate TeX \input and \openin files.
TFMFONTSExtra paths to locate TeX font metric files