What is the SC card slot all about?

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HP, power carriage travel, complete cross rail, internally cooled head 24 SC 803-548-8000 SRID:SR ID: 288950 Price:Price: Call for Price

hp omen m 2 slot S C Ying , A Charnes , and Edward Saibel 10 Nov 54 , 10p incl illus SLOT ANTENNAS AD

hpe 1000w flex slot titanium hot plug power supply kit Security cable slot 2 Vent 3 External VGA monitor port 4 USB charging port 5 Two USB ports 6 Smart card reader Right