LAS\FIND UPDATE [/OPT1 ...] The input index will first be appended with the new observations (if any) present in the input file. This saves time because a (much) smaller part of the input file is actually read. The current index is then reset and recomputed from the input index (i.e. with old and new observa- tions), as usual. FIND UPDATE does not wait for new data, but you can use the command NEW_DATA to do so. This keyword can be omitted if the SET FIND mode is UPDATE.