No, this is not fundamentally different. It is just another kind of output.
Sequential file INPUT in QBasic is just like reading data from the keyboard, except that all the data exists in a file before the program is run.
First we must create a file. Start the QBasic as usual. Instead of typing a program, type a list of three integers one per line as here:
Save the file using the menu system, much like you save a program file: hit ALT+F, and then S, then in the file dialog box enter a file name. Use DATA.DAT.
Push the tab key a few times until the cursor moves under the <OK> and then hit enter.
If you make changes to the file, you can save the changes just by hitting ALT+F+S which will update the disk file.
Could you use NotePad or some other text editor to create this file?