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The definition of variables : variables are variables that can save the computer system for a variable value stored in
the variable names are generally upper case variable names can be extracted directly variable
absolute path name plus the command alias name plus internal and external
environment variables : specify a directory, run software when the program will look for relevant documents in accordance with that directory. Set the variable most useful features for most people is: do not copy some dll files to the system directory, but this path is a series of system variables path search system dll files.
Important environmental variables :
