[Coco] BASIC09 GPLOAD clarification?

[CoCo Mongrel]

I'm a little uncertain about how GPLOAD in GFX2 is supposed to work.  More
importantly, how does it actually work?  The FM says it's supposed to load a
Get/Put buffer with data from a disk file.  The parameters listed in the
documentation (aside from the "GPLOAD" command) are group, buffer, format,
xdim, ydim, and size.  But nothing is mentioned about a path list, or a
pointer to a disk buffer, or anything that looks likely to actually get data
into the G/P buffer.  Also, the example given at the bottom of the page
(9-98 of the BASIC09 Reference) uses the "DEFBUFF" command rather than
"GPLOAD".  Am I just misunderstanding the purpose of GPLOAD, or is this
mal-documented?

cocomongrel