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HELP NCREV JL Cunningham This procedure is a non-copying version of *REV. This means that it does the same as REV but "destroys" its argument, so that it should not be used if any variables will refer to part or all of the original list after using NCREV. For example: [r h u b a r b] -> x; x --> [r h u ??y]; x => ** [r h u b a r b] y => ** [b a r b] ncrev(x)=> ** [b r a b u h r] y => ** [b u h r] There is also a faster non-checking version FAST_NCREV - see REF * FASTPROCS