The origin for client coordinates is the upper-left corner of the client area of the control or form.

工作区座标的原点位于控制项或表单的工作区的左上角。

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The location of the origin, relative to the screen, will vary depending on whether you are specifying screen or client coordinates.

原点相对于屏幕的位置因指定的是屏幕坐标还是工作区坐标而异。

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Because client coordinates are relative to the upper-left corner of the client area of the control, the coordinates of the upper-left corner of the rectangle returned by this property are (0, 0).

由于工作区坐标是相对于控件工作区的左上角而言的，所以该属性所返回的矩形的左上角坐标是(0,0)。

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All of this data is collated and matched against client-employee information, GPS coordinates, detailed flight information for every aircraft that is part of an itinerary for each employee and a matrix of client operational rules and requirements.

FORBES: Names You Need To Know: NC4 Situational Readiness