The data set qualifier indexing function lets you index the &DSN and &MEMN variables (for accessing particular qualifiers):

&DSN(1)

first qualifier of the data set name

&DSN(3)

third qualifier of the data set name

&DSN(&NQUAL)

last qualifier of the data set name

&MEMN(1)

first qualifier of the object name

&MEMN(2)

second qualifier of the object name

&MEMN(&MEMNQUAL)

last qualifier of the object name