Replace community strings programatically

I am trying to change the community strings in my agent programmatically
at run-time instead of loading them from the .conf file.  I've found the
vacm_parse_rocommunity() and netsnmp_config() functions, but when I call
them, the old community strings remain and new ones get added.  So then
I tried calling various combinations of
vacm_destroyAllViewEntries(),vacm_destroyAllGroupEntries() and
vacm_destroyAllAccessEntries(), and then calling netsnmp_config(), but
my agent just stops responding.

So my question is, is there a way I can _replace_ the current ro and rw
community strings programmatically (i.e. without reloading a config
file)?  If anyone can point me in the right direction, I'd greatly
appreciate it.

Thanks,
Josh

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