Define the Filename Area

Another pre-requisite of using the callable file handler is to set up a filename area: a data item containing the name of the data file, and depending on the type of file you are dealing with, a data item for the separate index file.

Again, in the working-storage section, beneath the FCD definition, paste the following code:
```
       01 ex-filename                  pic x(260) value "idxfile.dat".
       01 ex-index-name	               pic x(100).
```
These variables define the data file name and the separate indexed file (if the data file format uses one). Later, when setting up the FCD, you will set fcd-filename-address to the address of ex-filename, and fcd-idxname-adress to the address of ex-index-name.

Note: This tutorial uses an IDXFORMAT8 file, which does not use a separate index file (.idx file); therefore, the ex-index-name variable is not necessary in the running of this tutorial, but is included to demonstrate its use if you were to use a data file that required a separate index file (for example, IDXFORMAT12).
Press Ctrl+S to save the changes so far.

As you are going to be creating an indexed file, you also need to define a key definition block, which defines the index keys used in file operations on indexed files.