Hi Capulina
The only /GRCPI* transaction your end users would need to use is /GRCPI/GRIA_EAM for firefighter cockpit. If you install GRCPINW on the GRC system you can do this.
The transaction /GRCPI/GRIA_EAM - EAM Launchpad Logon is meant of decentralised Firefighting. This will allow your users access FF directly from the plug-in system without having to go into GRC.
Alternatively, if you are using centralised FF you can then use transaction GRAC_SPM from the GRC system.