If you have NIS configured, it'll be used by anything that needs to map
a uid or gid number to a name, or anything that needs a list of groups
for users, among other things.
That means (IIRC) that having a crontab implies a NIS lookup, because
creating a new session for your user needs to fetch supplementary groups
from NIS (even for root).
'ls -l' might also do lookups to resolve the uid/gid of your local
files. "local files" does not imply that there is no need for YP.
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