提交远程表单。
建立安全的通信后，Connection Manager向远程应用程序发送一个基于表单的询问，要求对方提供用户凭证。
After secure communications have been established, the Connection Manager sends a form-based challenge to the remote application prompting for user credentials.
其他小部件包括选项卡、图表、窗口（对话框）、树、布局管理器、增强的表单控件、工具栏和菜单、拖放操作和直接远程功能（direct remoting）。
Some of the other widgets that come with ExtJS include tabs, charts, windows (dialogs), trees, layout managers, enhanced form controls, toolbars and menus, drag and drop, and direct remoting.
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