[GTVDEF\]RENAME old1 [old2] /AS new1 [new2]
Renames a terminal definition in the current Binary Terminal Definition
File (see USE).
Arguments of the command refer to the old primary and secondary names.
Arguments of the option /AS refer to the new names.
Old names can be abbreviated as far as they remain non ambiguous. New
names are checked against any ambiguity with other terminal names.