When you start the Taverna Workbench, it automatically finds and loads the URLs of a default set of services that are commonly used (currently these services are mainly from the Life Sciences domain). You can search this default list by typing keywords into the Filter box at the top of the Service Panel in the Taverna Workbench 2.x. In Taverna 1.7.x, you have a similar Search box above the Available Processors in the top left panel of the Workbench.
If you do not find anything suitable or if you need to know more about a service and how it works, you can search the BioCatalogue.
The BioCatalogue is a curated catalogue of Life Science services. It contains descriptions of services and their inputs and outputs along with examples of input and output data. It also monitors services and provides information on their availability.
In Taverna 1.7.x, you can also find services by exploiting their semantic annotations using Feta. Feta can retrieve services by name, type, task, inputs and outputs descriptions, etc. For more information on how to install and use the Feta plugin, consult the Taverna 1.7.2 User Manual. There is no Feta plugin for Taverna Workbench 2.x, where the similar functionality will be provided by the BioCatalogue plugin. The plugin will be available in the second half of 2010.
