Where does grub receive initial screen settings?

[David Wyckoff]

Good day and howdy,

I am interested in knowing how grub gets its initial screen size.  
The example:

insert live cd (et al)
install distro
install grub to mbr   ---  

 Does grub get it's initial framebuffer/screen settings from the
 running kernel during install? and from which kernel process/file does
 this information come? 
                              Thank you for your time and
                              consideration, David Wyckoff,  aka
                              sleekmason