### 18.2.3. Reading Data with the User Input Option

The User Input option for Junction Box Location enables you to read in your own data stored in files using arbitrary data formats. An example of data you may want to read in is any kind of data table (for example, profile boundary condition) when the data is read during a CFX-Solver run, a special MMS data area called `/USER_DATA` is created before the user input call. In a parallel run, this call is made only on the master process. After the call, any data found in `/USER_DATA` will be automatically copied from the master to the slave processes, so it becomes available to all subroutines on all processes. Use of this MMS data area requires calls to basic CFX MMS routines. For details, see CFX Memory Management System (MMS).

In a parallel run, Start of Run calls are made on every partition, while User Input calls are made only by the master process.

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