What is the difference between Integrated Security = True and Integrated Security = SSPI?

Question

I have two apps that use Integrated Security. One assigns Integrated Security = true in the connection string, and the other sets Integrated Security = S

Answer 1

Let me start with Integrated Security = false

false User ID and Password are specified in the connection string.
true Windows account credentials are used for authentication.

Recognized values are true, false, yes, no, and SSPI.

If User ID and Password are specified and Integrated Security is set to true, then User ID and Password will be ignored and Integrated Security will be used