system will wait for notepad to finish executing before the Perl code continues. If you wanted to just launch notepad and continue then you would use exec.

Similarly if you just wanted to start the default application then you can omit the program and just exec the file. In this situation, exec may be essential because the default editor may support multiple documents and the user wouldn't necessarily want to close it. The Perl application won't have to wait. 

#launch notepad explicitly
exec ("notepad $path_to_text_file");

# or launch the default application
exec ("$path_to_text_file");

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In reply to Re^2: how to open a separate notepad by inman
in thread how to open a separate notepad by arunmep

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