Question

From ss64.com:
/I : Ignore any changes to the current environment.

What does that mean? If you could give examples of usage and what it effects or doesn’t effect, that would be great (none provided on website and have google searched with no luck).

Answer 1

If you modified the current environment by defining a variable;

set foo=bar
start app.exe

App.exe would see %foo% as being "bar"

set foo=bar
start /i app.exe

App.exe would see %foo% as being undefined.