NASM 2.05 based x86 Instruction Reference[ch155]
A.5.134 LDS, LES, LFS, LGS, LSS: Load Far Pointer LDS reg16,mem ; o16 C5 /r [8086] LDS reg32,mem ; o32 C5 /r [386] LES reg16,mem ; o16 C4 /r [8086] LES reg32,mem ; o32 C4 /r [386] LFS reg16,mem ; o16 0F B4 /r [386] LFS reg32,mem ; o32 0F B4 /r [386] LGS reg16,mem ; o16 0F B5 /r [386] LGS reg32,mem ; o32 0F B5 /r [386] LSS reg16,mem ; o16 0F B2 /r [386] LSS reg32,mem ; o32 0F B2 /r [386] These instructions load an entire far pointer (16 or 32 bits of offset, plus 16 bits of segment) out of memory in one go. LDS, for example, loads 16 or 32 bits from the given memory address into the given register (depending on the size of the register), then loads the _next_ 16 bits from memory into DS. LES, LFS, LGS and LSS work in the same way but use the other segment registers.