HP drivers
From WPKG | Open Source Software Deployment and Distribution
Most HP drivers come as InstallShield packages. The installer usually have name like sp<number>.exe, for example, sp32556.exe is the name for Broadcom network drivers.
In majority of cases they will install silently with a /s switch, i.e.:
sp32566.exe /s
Unfortunately, sometimes manual intervention is needed (i.e., using other InstallShield switches, recording the installation etc.), so there is no golden rule here.