Can we use write statements in screen fields, Computer Engineering

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Can we use WRITE statements in screen fields? If not how is data transferred from field data to screen fields?

We cannot write field data to the screen using the WRITE statement.The system instead transfers data by comparing screen fields names with ABAP/4 variable names. If both names are the similar, it transfers screen fields values to ABAP/4 programs fields and Vice Versa. This happens right away after displaying the screen.

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