batch

It is a Windows or Dos system file that used for doing many tasks in order. Batch processing files are saved with BAT extension.  

For creating batch file you should write necessary codes with Notepad. Then you should select File-Save options and pick the All Files from the save window which appears down side. Then you should entitle as example.bat. 

For changing BAT file its just enough to make right click and select Edit in option. You should remember to save file after editing process. 
You may use all the DOS commands during Batch creating process.

Example:
echo software starts
cd windows
delete text.txt