MASM address with colon

Question

I'm working with x86 MASM assembler. I've found wired call instruction, which has colon before the address:

  00459D2D: 9A 45 00 5F 9C 45  call        0045:9C5F0045
            00

Could somebody explain what is it? How it works?

Answer 1

That is the Call far instruction, it takes an absolute address that has a value both for the code segment and instruction pointer.

Ref: http://x86.renejeschke.de/html/file_module_x86_id_26.html

9A           = Call far instruction
45 00        = Value for code segment (0045)
5F 9C 45 00  = Value for instruction pointer (00459C5F)