Parameter 2 points to the arguments for the exec. The arguments are arranged as a vector of address/length pairs, one for each argument. The first four bytes are the address of the argument string. The second four bytes are the length of the argument string, in bytes. The vector must end in X'FFFFFFFFFFFFFFFF'. There is no limit on the number of arguments you can pass. Table 1 shows the format of the argument list. TSO/E provides a mapping macro IRXARGTB for the vector. The mapping macro is in SYS1.MACLIB.

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