A. Some programs return values to the command line and it may be you want these in a variable so they can be viewed/queried by other processes.
The easiest way to put the result into an environment variable is to trap it in a FOR statement.
C:\>set NTVersion="Windows NT Version 4.0 "
"Windows NT Version 4.0 "
If you place the command in a batch file you require two % in front of i, e.g.
For /f "Tokens=*" %%i in ('ver') do set NTVersion="%%i"