How to open multiple QGIS windows with different user profiles

Example 1:

@echo off
echo [core] >"%USERPROFILE%\AppData\Roaming\QGIS\QGIS3\profiles\profiles.ini"
echo. >>"%USERPROFILE%\AppData\Roaming\QGIS\QGIS3\profiles\profiles.ini"
echo defaultProfile=default >>"%USERPROFILE%\AppData\Roaming\QGIS\QGIS3\profiles\profiles.ini"

"C:\\Program Files\\QGIS 3.4\\bin\\qgis.bat"

Example 2:

"C:\\Program Files\\QGIS 3.4\\bin\\qgis.bat" --profile default

or 

"C:\\Program Files\\QGIS 3.4\\bin\\qgis.bat" --profile Marios

or 

"C:\\Program Files\\QGIS 3.4\\bin\\qgis.bat" --profile test