service/norestart is a SAP Parameter attribute which is used to control Disable automatic service restart after executable update (Windows onl information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
If this parameter is activated, the start service no longer restarts
itself when its executable has been updated (by sapcpe).
The parameter should not be activated in general, but can be useful in
HA configuration.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.