UFH Variables and Value Types

Double	a double-precision floating-point value
String	a sequence of ASCII characters; internally stored as a null-terminated array of characters
Stream	a pointer to an input or output stream; returned or used by I/O functions
LineHeader	a USP line header object [includes the historical line header]
Trace	a USP trace object; consists of a trace header and a trace time series
Nothing	a special type for which the only legal value is itself; used to flag uninitialized variables and to clear memory during execution
Array	an array of any legal types [including arrays]
fVector	a special type of array holding only numeric values; internally stored as single-precision floating-point values

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