OT: rsync auth question

[Mike Wright]

Hi all,

I've been trying to use a script to pull some data from a remote machine 
using rsync.

According to the manpage I shouldn't have to interactively provide a 
password if I set RSYNC_PASSWORD.

No success.  In desperation I went so far as to set it on *both* sides 
yet I still receive a password prompt.

Anybody out there an rsync hero?

Thanks to all,
Mike Wright