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The following, just for fun, are from the Microsoft Manual of Style:
Use only to refer to the separate areas of a split or single window. For
example, in Windows Explorer, the names of all the folders can appear in one
pane and the contents of a selected folder in the other pane. Use lowercase
for pane names, as in "the annotation pane."
Avoid in end-user documentation to refer to a nonbrowser section of a Web
page. Also avoid in technical documentation unless you are specifically
referring to frame technology, not just a section of the page. (Many Web
sites use tables, not frames, to divide a page.)
"Frame" has a number of other computer meanings (see the Microsoft Press
Computer Dictionary), so be sure to define it if the context is unclear.