While checking the Palm website for anything new I discovered this footnote for Touch-to-share:
I guess that means no (or limited) Touch-to-Share capabilities with another person's TouchPad.Easily share a URL between your Pre3 and an HP TouchPad simply by tapping them together.1,8
8. Requires TouchPad with webOS 3.0 and Pre3 or Veer with webOS 2.2 or higher, both products having same HP webOS account. Viewing URL web page content requires data connection via Wi-Fi or cellular connection.
Also, both Pre3 and TouchPad need to be on the same webOS account for the TouchPad to answer calls and text messages from Pre3.
Link: HP Pre3 | Business Smartphone, Business Mobile PhonesReceive text messages and answer phone calls on a TouchPad so you donít miss a thing.9,10,11
11. Pre3 and TouchPad must have same HP webOS account.