This keyword declares a constant that can be used in a formula.
Ex: CONST PI=3,141592653

Declares a formula.

Ex: GRAPH "My value"(°) = SIN(DEG(ID1))

Declares the mathematical expressions that generate ratios, i.e. new columns in the data table.

ex: KEYVAL test = SUM/N

Declares a function. Common features are, for example, f (x), v (t) mm. You can also have a function with more operands, such as Y (z; x) and so on.
Ex: FN f(x;y) = (5*x) - y

GRAPH function tests (r / min) = f (ID1.med, ID2.med)

Used to write a comment. Can also be used to prevent a formula from being executed.
Ex: REM GRAPH test(°C) = Tempinne.max - Tempute.min

Used to give your channels more manageable names in the formula.

Ex: SET U2 = 'voltage R2'

SET I1 = 'Power R1'

CONST R1 = 50000

GRAPH test (V) = U2 - R1 * I1