==ABOUT==
G-CRAN is a package which is used to install packages from CRAN-style (Central R Archive Network) repositories, that is, from R package repositories. R, in turn, is a language used for statistical and biocomputational research and development. Hence, there are also two repositories alongside CRAN called the Bioconductor repositories, which contain biological code and data.

==USAGE==
To use G-CRAN, you need to use g-common, or, if your package manager has integrated g-common support, whatever system your package manager uses. Simply install G-CRAN (note that G-CRAN depends on R) and g-common, and use g-common as described in its documentation.

==EXAMPLE REPOSITORIES==
Some supported repositories include:
- CRAN: http://cran.r-project.org/
- Bioconductor code: http://bioconductor.org/packages/devel/bioc
- Bioconductor annotation: http://bioconductor.org/packages/devel/data/annotation
Please note that the Bioconductor annotation repository depends on the code repository, so please install both if you'd like to use the Bioconductor databases.