|First||[maxkey]||Maximum key number found|
|Second||[ncols]||Number of columns in use|
|Third||[nkeys]||Number of keys in use|
.DOCUMENT FILE: DOC555
[Enter the name of an existing document file.]
[E.g. let's say the document file has the first 490 keys filled, then skips nine keys, and fills key number 500. The maximum number of columns in the document file is 4. The operation listed above will set [maxkey] to: 500, [ncols] to: 4, and [nkeys] to: 491.