# Recoll user manual
Introduction

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### Configurations, multiple indexes

The parameters describing what is to be indexed and local preferences are defined in text files contained in a configuration directory.

All parameters have defaults, defined in system-wide files.

Without further configuration, Recoll will index all appropriate files from your home directory, with a reasonable set of defaults.

A default personal configuration directory (`$HOME/.recoll/`) is created when a Recoll program is first executed. It is possible to create other configuration directories, and use them by setting the `RECOLL_CONFDIR` environment variable, or giving the `-c` option to any of the Recoll commands.

In some cases, it may be interesting to index different areas of the file system to separate databases. You can do this by using multiple configuration directories, each indexing a file system area to a specific database. Typically, this would be done to separate personal and shared indexes, or to take advantage of the organization of your data to improve search precision.

The generated indexes can be queried concurrently in a transparent manner.

For index generation, multiple configurations are totally independant from each other. When multiple indexes need to be used for a single search, some parameters should be consistent among the configurations.

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