rdisp/icm_startup_args is a SAP Parameter attribute which is used to control Additional command line parameters for ICM 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 .
Use this parameter to configure additional parameters that are coped to
the ICM at startup. This should only be necessary for troubleshooting.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.