Is this information about POS backends still valid?
FTA:
"Wal-Mart has thousands of servers nationwide, and any one of them crashing would ordinarily be a routine event."
"Someone had installed L0phtcrack, a password-cracking tool, onto the system, which //crashed the server// when the intruder tried to launch the program." [emph. added]
From http://www.sco.com/company/success/story.html?ID=21 :
"Nearly all of the 350 chains using PDI/RMS are deployed on SCO UNIX® technology [...]"
"McLane Co., Wal-Mart's wholesale subsidiary, acquired PDI in 1991. Fischer says one goal of the acquisition was to achieve tighter integration with some of the 30,000 c-stores that McLane serves. However, PDI continues to operate as a stand-alone entity and many of its customers are served by other wholesalers."