Yes, this is true. There are a number of "secret" functions on the HP Printing Mailbox that assist in testing, etc. The one you reference from Walt Mossberg's article is correct. But as you correctly mention, this is not meant for someone's Mom or Dad to figure out. But it is really not that difficult, so feel free to use it if it helps.
Presto Insider: Peter Radsliff
CEO, Presto Services Inc.




Any updates on a compiled list of features?
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