How can I implement a recursive update within triggers?

Given
INSTANCE (table)
INST_ID
etc.
INSTANCE_STRUCTURE (table)
PARENT_ID (fk to INST_ID)
CHILD_ID (fk to INST_ID)
And that I COULD write code which recursively navigates the hierarchy (ie. START WITH parent_id = ? CONNECT BY PRIOR child_id = parent_id) and issues UPDATEs to each "child" along the way, thereby propogating the desired update, how can I accomplish the same thing using triggers?
Keep in mind I am using Oracle 7.3 and I have no choice. Also, the DBA is very difficult to get a hold of and I have no idea if there may be some server settings which are preventing some of my attempts from succeeding.
Of course the simplest method is to make an update trigger on INSTANCE select all CHILD_ID from INSTANCE_STRUCTURE and issue UPDATE to each which, in turn, would invoke the same trigger, however, we can't have a mutating table, now can we?
Next, I tried the old global variable in a package bit. That's when I first started getting this "end of channel" business which essentially disconnects me from Oracle (while using SQLPlus). I started to debug that, and then other users started getting errors ... apparently due to the global variable being global ACROSS sessions ... which I did not expect (correct me if I'm wrong and I can try it again), however, due to the amount of data I'm dealing with in any one particular line of hierarchy, I'm not sure I wouldn't get an error anyhow ... particularly if I have to maintain a global array for everyone at once. Anyhow, it was during that, that I realized the "too many open cursors" thing and so I started working with START WITH CONNECT BY to identify all rows which must be dealt with.
Then, I tried setting up some new tables (as opposed to global variables) in which I would identify userenv('sessionid') and other data so that a BEFORE UPDATE, FOR EACH ROW trigger could check to make sure that the AFTER UPDATE trigger had not begun yet (IOW, not recursing yet). Basically, everything's fine until the AFTER UPDATE trigger tries to apply UPDATEs for the children (identified from a cursor on START WITH CONNECT BY) ... then I get the "end of channel" thing again.
Obviously, this whole thing is an attempt to denormalize some data for performance reasons.
Any help would be appreciated.
Thanks.

Nevermind, I figured somethin' out.

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