Method of programming a target system (ZS) redundantly executed, which has at least a first and a second target computer (ZR1, ZR2) in which the game data identical target system (ZDS) are stored, computers are connected over an interface to a system of data transmission (DUS) can be selected by a control command, in which a) is generated from a training project for the target system (ZS) a game data destination system (ZDS) by means of a data processing system (DES); B) the data set target system (ZDS) is transmitted through a system of data transmission (DUS) codifying a first key (S1S) on the first target computer (ZR1) and codifying by a second key (S2S) in the second target computer (ZR2); C) is decoded and the data set target system transmitidode encrypted form respectively using a decoding key stored in the first and the second target computer (ZR1, ZR2) is stored; D) is encoded again the data set target system (ZDS) same with respectively a third or fourth key (S3L, S4L) stored in the first and the second target computer (ZR1, ZR2) and transmitted back to the data transmission system; E) may form in the system data (DUS) a first and a second checksum (1MD4, 2MD4) from the set of system data coded destination and retransmitted, F) is coded by the system data processing (DES) data set target system (ZDS) with the third and fourth key (S3L, S4L) and form data set target system coded a third or a fourth checksum ( 3MD4, 4MD4), wherein the first, second, third and fourth checksum (1MD4,2MD4, 3MD4, 4MD4) comprising respectively a first and a second part; G) the first part of the third and fourth checksum (3MD4, 4MD4) system data (DUS) are compared with the first part of the first or second checksum (1MD4, 2MD4) and It is acknowledged in case of coincidence; and H) the second part of the first and second checksum (1MD4, 2MD4) in the system data (DES) with the second part of the third or the fourth checksum is compared (3MD4 , 4MD4) and acknowledges receipt in case of coincidence.
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