E.g Callback services, most of which are garage-side start-ups, have soared in popularity and sophistication in the last several years.

电话回话服务公司大多是一些只有车库那样大小的新兴公司。最近几年来，它们备受欢迎，并日趋成熟。

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Note that Warehouse X actually refers to a pair of Web services: Warehouse and Warehouse Callback.

请注意，仓库X实际上指一对Web服务：仓库和仓库回调。

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This article described a custom JAAS callback handler that enables a Web service client program to dynamically set the username and password when using Web Services UsernameToken authentication.

本文描述了自定义JAAS回调处理程序，在使用Web服务UsernameToken身份验证时，该处理程序使Web服务客户端程序能够动态设置用户名和密码。

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What about callback services?

CNN: Getting Ready for 1997