retf for 16bit or 32bit? CS:IP or CS:EIP?

Hi,

there are a few tutorials on how to write your own boot sequence
(http://www.tutorials.de/tutorials2070). The booter loads a program (a
BIN file) into the RAM am position 0x1000, puts the Adress
0x0000:0x1000 on the stack and calls the retf function to jump to the
loaded program.

I wondered where to define weather the program is a 16 Bit or a 32 Bit
program?

This means when can I use the extended data registers (eax, ebx, ecx,
edx) and adress registers (esp, ebp, eip, esi, edi)?

How does the assembler know when to load the address from the stack as
CS:IP and when to load the address from the stack as CS:EIP?

THX, Langi
.

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