Keeping a Win7 printer share shared to XP SOLVED

Just when I though Win7 was infallible - Vista-like inconsistencies appear where you least expect them...

I needed to share a printer off Win7Pro to an XP Home machine. Despite all the best efforts going both the old-fashioned way [create identical userid and password on both machines], and the new way every says it's done: http://www.howtogeek.com/howto/windows-7/share-files-and-printers-between-windows-7-and-xp/.

No cigar. I still got prompted for the userid and password after each restart. (As reported by lots of other posters.)

However, it occurred to me that by mapping a shared folder using a simple net use batch file, the user id and password if valid for the share, would eliminate the need for it again when reconnecting to the printer share.
Voila.
It worked.
net use z: \\win7pcname\foldershare /user:win7pcname\username passwordhere

Now put THAT in your pipe and smoke it win7 !