HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 518)

Test run and program run
17.3 Functions for program display
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
17.3 Functions for program display
Overview
In the Program Run modes of operation as well as in the Test Run
mode, the TNC provides the following soft keys for displaying a part
program in pages:
Functions Soft key
Go back in the program by one screen
Go forward in the program by one screen
Go to the start of the program
Go to the end of the program