Want to understand if its possible to customize the ISG operating system.
Want to understand if it is possible to install/run any software packages or third party code on ISG.
How secure is ISG?
Integrated Secure Gateway (ISG) OS running on Symantec Security Platform (SSP)
ISG is a hardcoded special purpose operating system.
Its not possible to install or run any third party code on it.
This makes the software secure from any malware or executable file threats hence eliminating need for Antivirus solution to be installed on it.
Please refer the ISG security best practices below.