Disc Operating System (DOS)
You suspect that your automatic modem dialer is not working correctly. Which of the following commands will manually dial the number 123-4567?

ATM 1234567
AT1234567
AT1234567DL
ATDT1234567

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Disc Operating System (DOS)
Which of the following applies to Internal DOS commands?

Internal commands can be run whenever the DOS prompt is displayed
Internal commands are stored on disk separately from COMMAND.COM
Internal commands are reserved for DOS-level programming
Internal commands can only be executed from a batch file

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