THIS             Create operand at current location                  Operator

  THIS addr_type                        ; Ideal mode
  THIS expression                       ; MASM mode

    Creates an operand whose address is the current segment and location
    counter.

    addr_type describes the size of the operand and whether it refers to
    code or data.

    In MASM mode, expression must be one of:
    UNKNOWN (0), BYTE (1), WORD (2), DWORD (4), PWORD (6), QWORD (8),
    TBYTE (10d), NEAR (0FFFFh), or FAR (0FFFEh)

    Example:    wdptr EQU THIS WORD