At either the Windows DOS prompt or a normal DOS prompt, type mem to see your current memory usage; type mem/p/c to see where your conventional and upper memory is.
Type dir/s "filename" (name of the file without the qoutations)
to locate a file from the Command Prompt.
MS-DOS in Windows now lets you use a wildcard before as well as after text. So, for example, DIR *app*.txt will display all .txt files with app in their name.
When at a DOS prompt (command line) from within Window, you can switch between full-screen and Windowed mode by holding down Alt + hitting the Enter key.
If you add a "?" to the command line of MS-DOS programs, and you will be prompted to add parameters when you start the program. This is especially useful with MS-DOS program shortcuts.
Create a shortcut on the desktop with "DISKCOPY A: A:" at the command prompt to copy a disk (Substitute B: to use B: drive).