US 6,981,634 B2
Keystroke trapping system, keystroke trapping method and keystroke trapping program
Katsuya Ogawa, Kanagawa (Japan)
Assigned to NEC Infrontia Corporation, Kanagawa (Japan)
Filed on Oct. 27, 2003, as Appl. No. 10/692,849.
Claims priority of application No. 2002-312953 (JP), filed on Oct. 28, 2002.
Prior Publication US 2004/0084516 A1, May 06, 2004
Int. Cl. G07G 1/00 (2006.01)
U.S. Cl. 235—12 12 Claims
OG exemplary drawing
 
1. A keystroke trapping system comprising:
a first means for reading out, in sequence, function numbers in sales data stored in a memory unit, collating them with function numbers in a depressing limit master stored in the memory unit in sequence, and when they are coincided to each other, adding 1 to a limit counter of the depressed function key corresponding to the function number;
a second means for comparing a value of the limit counter of the function key corresponding to the function number with the corresponding limit count in the depressing limit master;
a third means for sending it to a host computer that the depressing of the key corresponding to the function number exceeds the limit count if the value of the limit counter exceeds the limit count;
a fourth means for resetting the limit counter.