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OFFSET Offset of Expression MASM Operator
OFFSET expression
Returns the number of bytes between the expression and the beginning
of the segment it is defined in.
Notes: Expression can be a label, segment name, variable, or
other symbol.
In order to generate valid offsets when accessing
variables in groups or segments, use the segment-
override operator (':') to force OFFSET to calculate the
offset relative to the start of the group or segment.