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ArcPad stores an internal list of methods and parameters used for transforming coordinates between two datums. When more than one transformation method or set of parameters exists for two datums, ArcPad, by default, uses the first match it finds in this list. The default transformation method ArcPad uses can be overridden by modifying the file defaulttransforms.dbf in ArcPad's System folder.
Datum transformations work in either direction.
For example, the transformation listed as NAD_1927_to_NAD_1983_NADCON will transform from from NAD 1983 to NAD 1927, as well as from NAD 1927 to NAD 1983.