Linux: GNU/Screen Scroll Up and Down Look At Data

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I am using GNU Screen software application to multiplex several virtual consoles. I can access multiple separate terminal sessions inside a single terminal window over remote ssh terminal session. Often I need to go though server logs located in /var/ directory. I can not seem to scroll up when I run tail -f /var/log/messages or /var/log/secure file. How do I use page-up / page-down keys to scroll up under GNU scree?

Screen Command: Set Baud Rate [ Terminal Communication ]

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I need to do router or network switch configuration via a console port such as COM1 (ttyS0 under Linux). How do I use the screen command for a serial terminal emulator network with different baud rates under UNIX or Linux operating systems?