Basically, it is just what it sounds like.
Depth options for holes:
Blind Cuts to a user specified depth
Through All Cuts the hole through all intersecting solids
Through Until Cuts through until the selected surface or plane
To Next Cuts to the next surface
To Selected Cuts to the selected point, curve, plane or surface.
I know the description of each other I have search through the help before
posting in this newsgroup... What I wanted to have is a example that would
explain it more explicitely, because from the description in the help the
two options appear to do the same thing when a surface is selected. I found
out that with a circular section that needed to be extrude up to a surface
that if you choose THRU UNTIL and the complete section is not crossing the
surface, the feature does not work however if I choose TO SELECTED the
feature worked even though the section did not completely pass trough the
surface.... Thanks for taking the time to reply.