Gilean/Oghma

Ok heres two big "sage of all things" gods, but heres my question, do they
know everything about SJ?  one of my friends is trying to tell me that Oghma
knows everything about everything no matter what sphere it is in.  I believe
he knows toril, and to a certain extent realmspace, but not much further
than that (i base this belief on the chronicles of astinus in the beyond the
moons novel, and the fact that gilean/oghma are very closely related in game
terms).

Now i am looking for game terms, not book related terms, so thats why im
asking everyone else.  My mate rekns hes read in a TSR book that Oghma knows
everything of everything everywhere, but i disagree.  My mate has a slight
tendency to lie about things he believes should be right occasionally, but
he is occasionally very much right aswell, and i cant tell the difference
when hes lying/exaggerating or hes really right.

anyway the main question is "Would Oghma know everything/specifically about
greyspace - its planets and inhabitants?"

Tilaurin
tilaurin@??????.???.au or tilaurin@???????.com if the first is broken
"Because by fate even the gods are cast down/Weep ye all with me"

<sorry if this is all confusing i got interrupted half a dozen times while
trying to write jsut this short question>