PS: I finally understood the S_db_Blocked issue (after reading the code
in base and then re-reading the doc): S_db_Blocked is only returned if
an existing put notify block in the target record is the *same* object
(address comparison) as the one that is now being given as argument.
Multiple putNotifies to the same target record seem to be no problem at
all as long as they come from different clients, otherwise they are
ignored. This is make sense, indeed. The Developer's Guide could be a
little more clear on this point; it says "If a putNotify is already
active..." which is of course fine if one already knows what is meant.
