Gnumeric has been connected to external data sources such as stock quotation service data streams using an experimental plugin. This requires the ability to write programming code. Information on extending Gnumeric by developing plugins can be found in the section called Section 13.4 ― Writing New Plugins and the actual computer source code can be found in the directory gnumeric/plugins/sample_datasource/ of either a distribution of Gnumeric or in a code checkout from the concurrent versioning system (CVS) repository.