gtkrc: differences between gtk_rc_add_default_file() and gtk_rc_parse()?

[Jiason Li <listjiason gmail com>]

Hi all,

I was able to customize my app's look-and-feel by my own gtkrc file,
using gtk_rc_parse()/gtk_rc_add_default_file().

according to the doc,
gtk_rc_parse(): Parses a given resource file.
gtk_rc_add_default_file(): Adds a file to the list of files to be
parsed at the end of gtk_init().

since both of them worked,
I'm wondering what the differences are between them. :-/

any info are appreciated. :-)

regards and thank you,
jiason
20090617