The port you use is only a variable in the context of your program. It will have no impact on
how you write the program. Unless you're attempting to write malicious software, there shouldn't be an issue in prompting the user for the appropriate port number.
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If I say "Open comport1", but it is in fact a serial port for example, then it will send the info I tell it to send to whatever is connected to the serial port and potentially f**k up that peice of hardware.
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Sending AT commands over an RS232 connection will not adversely affect a connected piece of hardware. Some older external modems actually do use a serial port.
Why do you want to dial phone numbers on other people's machines? What is the purpose of your program? Also, why use QBasic?