a mouse built into the key board are that has no moving parts ,it senses the location you want the cursor to move and also has two buttons below it ,is right and left click.the scroll is on the right of the pointer .
i remember using basic and using dos that had to be installed and turned with an uploaded 5 by 7 floppy disk and a separate one for storing your data in your file ,Windows were in that ,Windows is a dos system ,just instead of loading it daily its built in .
Tandy corp or radio shack and the Commodore ,and Amiga and mac by Apple worked like this ,I learned basic on an apple computer and also Pascal on an Amiga .16 bit monitors was the stuff then