At WalMart, I went to one of the customer-computer hiring kiosks & decided to play around...
I was clicking around & finally got an old-school "Task-Manager, Users, Performance.etc." mennu (the old ctrl+alt+del menu).
I got in using Ctrl+Alt+Tab+Shift+Esc (or something VERY similar)
There was only one program running (the Hiring Program), & Disabling any Processes or Logging any other Users on the network off was disabled (only one user didnt have his security set, so i logged him off, but he back on in 5min, eh): You may have more luck if your WalMart forgets to setup certain security rights.
The only fun thing i could do was send messages to certain computers/users: like telling the Sports department they were needed in aisle 2, & stuff like that.
I could also open the windows help file (multiple text documents) & print to which ever printer was available on the network: so i made sure to print 999 copies of the shortest text document (more wasted paper) to every printer on their network
Also, at OfficeMax, they have a printing section, called Impress where they have little tabletop computers for choosing designs & gift ides & shit: just double click one of the corners (forgot which one; think its the top-left), & the defsult password is the store number. (mine was like 607 or 670 or some shit). This gave some interesting information, like customer receipts w/ email included, which would be great for some social-engineeringto get a cc or two). I was having some of those "Toilet Camera" stickers printed on their cheap gloss paper, so i only had limited time, but found some interesting features, like viewing the names, purchases, & emails of purchases made on certain dates, & that was the only feature i looked into before paying for my stickers.
*Anyone else got any other info/stories of "hacking" computers for customers at any other popular stores???