Use case:

Instant messaging for employees both in the company's internal network and on the internet
Document collaboration
Creating text conferences
File transfer
Availability status sharing

Subsystem elements:

• Instant messaging servers
• Gateways for connecting to instant messaging servers from the internet

Benefits of the subsystem:

• More efficient communication between employees
• Convenient control of employee availability
• Correspondence history storage on local servers within the organization's perimeter