Unit 6, Section 7: Command Code C and Codes by Function

This video describes command code C. This command permits a single SSA to serve as a qualified SSA for multiple levels; as we have seen, in the absence of the C Command Code if we want to explicitly specify a qualified SSA for all levels of a call, we would need a qualified SSA for each level. The video also covers which command codes are valid in the SSAs associated with the various DL/I call functions that we have covered in earlier units.