help npp_save

in the NppExec Console says:

COMMAND:  npp_save
USAGE:
  npp_save
  npp_save <file>
DESCRIPTION:
  1. Saves current file ("npp_save" without parameters)
  2. Saves specified file if it's opened in Notepad++
     (supports a partial file path/name)
EXAMPLES:
  npp_save         // saves current file
  npp_save $(#2)   // saves 2nd file opened in Notepad++
  npp_save txt     // saves a first file which contains "txt" in its name
SEE ALSO:
  npp_saveas, npp_saveall, npp_open

2. Typing

help cd

in the NppExec Console says:

COMMAND:  cd
USAGE:
  cd
  cd <relative_path>
  cd <absolute_path>
DESCRIPTION:
  1. Changes current directory ("cd" with parameters)
  2. Shows current directory path ("cd" without parameters)
EXAMPLES:
  cd       // shows current directory path
  cd ..    // go to up-directory
  cd \     // go to root-directory
  cd $(NPP_DIRECTORY)    // go to notepad++'s directory
  cd e:\temp            // change drive and directory
SEE ALSO:
  dir

3. Typing

help npp_run

in the NppExec Console says:

COMMAND:  npp_run
USAGE:
  npp_run <command>
  npp_run <file>
DESCRIPTION:
  1. The same as Notepad++'s Run command - runs an external process
  2. Opens specified file in its associated program (requires NppExec v0.2 RC3.1 or higher)
EXAMPLES:
  npp_run calc.exe    (*)
  * if you type just "calc.exe" without "npp_run", then NppExec runs
    "calc.exe" as a child process and waits until it returns (i.e. until
    you close the calc's window)
  npp_run "index.html" // opens "index.html" in your default web-browser
  npp_run "C:\Program Files\Mozilla Firefox\firefox.exe" "index.html" // in Firefox
  npp_run "$(FULL_CURRENT_PATH)" // opening using the associated program
REMARKS:
  In terms of an application (a program), NPP_RUN allows to run it in its own
  window without waiting for its execution:
    npp_run application.exe
    npp_run application.exe <arguments>
  If, however, there is a need to wait until the application has been executed,
  while still running it in its own window, it can be achieved without NPP_RUN:
    cmd /c start /wait application.exe
    cmd /c start /wait application.exe <arguments>
  In this last case, NppExec waits for cmd to be executed, while cmd itself
  starts the application in its own separate window and waits until it has
  been executed.

4. Type just

help

in the NppExec Console to see all the available environment variables and commands.

, probably.