2.1.477 Part 1 Section 17.16.5.25, HYPERLINK
a. The standard does not list \h as a possible switch for the HYPERLINK field.
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In Word, the \h switch for the HYPERLINK field means that when the hyperlink is invoked, the target of the hyperlink should not be added to a list of viewed hyperlinks.
b. The standard does not list \s as a possible switch for the HYPERLINK field.
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In Word, the \s switch is used for the HYPERLINK field with the same meaning as the docLocation attribute of the hyperlink element.