Here is some brief info about NppExec for new users:

• NppExec adds a Console window at the bottom of Notepad++'s window;
  This Console window allows to run different console programs directly in it;
  Also there is Plugins -> NppExec -> Execute… window that allows to execute NppExec’s scripts (set of commands).
• NppExec’s commands and variables are listed in the “NppExec.txt” file.
• To get more details, type “help” (without the quotes) directly in NppExec’s Console. To get a detailed help about any NppExec’s command, type “help [command]” - e.g. “help npp_open” or “help set”.
  And don’t forget about Plugins -> NppExec -> Help/Manual.

Installation:

• Just unpack the NppExec zip-archive to the folder “Notepad++\plugins”.
  It will extract the file “NppExec.dll” as well as the “doc\NppExec” and “NppExec” subfolders.