No, currently it is not possible for a Portal User to view Requests related to other customers. However, a portal user can add requests and track his/her request status in customer portal. For more refer Portal User Action
Once you have created a new "Portal User" (Goto Setup--->Customer Portal Settings--->Customer Portal Users), an invitation e-mail would be sent to the Portal User with a confirmation link. When the Portal User confirms by accessing the link, they can ...
You can setup four level's of escalation for your organization. To setup escalation matrix, you have to create SLA's. Goto Setup > SLA Settings > Service Level Agreements > Create SLA, specify criteria and setup Escalation Levels. Refer SLA and ...
To hide few tabs/modules for your organization, Goto Setup >Tab Settings >Organize Tabs >remove the unwanted tabs from the display and save the settings.