HP Business BASIC/XL Reference Manual - HP 3000 MPE/iX Computer Systems - Edition 1 (32715-90001)

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argument's value is -1, the underlying native language number is used as
the language specifier. If a non-negative value is used, that number is
taken directly as the language specifier. If the native language option
is not specified, then the option defaults to zero. The following
functions include parameters for NLS:
LWC$
UPC$
LEX
DATE$
TIME$
These functions are defined and explained in chapter 5.