To obtain the GDS input and output set and subsets, a task normally does not call the basic user input routines directly, but calls one or more routines from a collection of specialized routines. ... The function GDSINP is used to obtain an input set and subsets, i.e. where the task gets its data from. ... Before the function to obtain the output set and subsets (GDSOUT) can be called, it is necessary to relate the input set to the output set. ...