Sorry, I have one more question here: How to transfer the Btcs in my online Armory (watching-only wallet copy) into another offline Armory (on another old laptop) via a USB flash stick?
After having carefully refered to the Amory tutorials on their webpages, I've successfully made installation of Armory on my offline laptop as well as on an everyday-using desktop pc. I've also made a watching-only wallet on the desktop and sent from my another address 0.25 Btcs to the online Armory (watching-only wallet copy).
Now my question is: Shall I transfer the money via USB flash stick back to the offline Armory? And if I should, how to do it? I've earnestly checked the help text on their webpages but got no clue. Thanks again!
To send your Bitcoins to your offline wallet, it should have one or more Bitcoin addresses. Go to your online wallet, and send your Bitcoins to the offline wallet address.
The coins will be sent to the offline address, even if the offline wallet is never connected to the Internet.
If you just want to access your wallet on the offline computer (not send coins to it), just put your wallet.dat onto a USB, and import it on the offline machine.
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Good luck!