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Chapter 5: Scripting Commands The string “1000003” would then be written to the external file called “COUNTER.TXT”. This function can be used with the READFILE function to read and write a file that contains a counter. For example, you can store the next check number used by a check printing application in an external file. Then you can read this file to know the current check number, and then increment that number and write it into the same external file. 166 Capella Technologies, Inc.