This first method is useful for someone who wants to launch dosbox automatically in full screen mode each time they use it. To do this open the directory where dosbox is located on your hard drive (example c:\dosbox).
Next: Look for the file dosbox.conf. This is the configuration file for dosbox. It essentially tells dosbox which settings are wanted each time dosbox launches.
Now: When you find the file right click on it. Click "open with" & select notepad.
Next: With the dosbox config file open find the line "fullscreen=false" under the section labeled [sdl] near the top. Change the command to "fullscreen=true" then save and exit.
Now each time you launch dosbox it will be in fullscreen mode. If you want to change back to your original setting in the future just change the command "fullscreen=true" back to "fullscreen=false".
This method is much simpler but must be done each time dosbox is running. Simply hold down the keys Alt and Enter and you can switch between full screen and windowed mode.
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