Benefits:

Reduced Data Leaks: Ensures information isn't unintentionally leaked through residual data in shared resources.

Enhanced Confidentiality: Protects sensitive information from unauthorized access by users who shouldn't see it.

Improved Compliance: Helps meet regulatory requirements for data protection.

Accountability:

Senior Management: They set the security tone and allocate resources. They're accountable for ensuring a security policy exists that addresses shared resource control and for providing IT security with the budget and staff to implement it.

IT Security Team: They implement the control. This includes defining procedures for clearing or sanitizing shared resources after use, and identifying and mitigating covert channels (information leaks through seemingly unrelated actions). They report to senior management on control effectiveness.

System Owners: They're responsible for understanding the security requirements for their systems and data. They cooperate with IT security to ensure shared resources used by their systems comply with the control's procedures.

Individual Users: They're accountable for following security policies. This includes properly closing applications and files to minimize residual data in shared resources. They should report any suspicious activity to IT security.

Implementation:

Clearing/Sanitizing Resources: When a user finishes with a shared resource, it's overwritten with random data or zeroes to eliminate traces of previous information.

Memory Management: Operating systems can be configured to automatically overwrite unused memory sections. This ensures previous data isn't accessible even if a program crashes.

Covert Channel Prevention: Monitor for suspicious data patterns in shared resources that could be used for unauthorized communication (covert channels).