The following in-built functions operate in a single address expression operand:

SEG

Returns the segment or selector portion of an address that resolves to either a &segment:offset or #selector:offset form.
OFF
Returns the offset of an address the resolves to either a &segment:offset or #selector:offset form.
BY
Returns one byte from an address location.
WO
Returns one word from an address location.
DW
Returns one double word from an address location.
POI
Returns one double word far pointer (selector:offset or segment:offset address) from an address location. The low order word returned is treated as the offset. The high order word returned is treated as a selector or segment based depending on the default addressing mode. See the D command for more information.
PORT
Returns one byte from an 8-bit I/O port address.
WPROT
Returns one word from a 16-bit I/O port address.

Example:

    DD %(dw(%7abcde0+10))

Display the storage whose linear address is at location %7abcdf0.

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