The SET statement provides a means for:
SET { index-name-1 } ... TO { arithmetic-expression-1 }
{ identifier-1 } { index-name-2 }
{ identifier-2 }
SET { index-name-3 } ... { UP } BY arithmetic-expression-2
{ DOWN }
SET { mnemonic-name-1 } ... TO { ON }
{ OFF }
SET { condition-name-1 } ... TO { TRUE }
{ FALSE }