The ArcWeb Services JavaScript API was designed for developers who want to integrate Web-based mapping into their applications without spending a significant amount of time developing code or spatially enabling a database. Designed for the easy deployment of mapcentric, rich Internet applications (RIAs), this API provides access to a wide variety of on-demand mapping functionality and content. Based on AJAX and Adobe Flex, it is a subset of the ArcWeb Services family of APIs that include SOAP, REST, OpenLS, and Java ME—all hosted by ESRI. These APIs can augment an existing GIS installation or be used by themselves over the Internet.