MTS provides role-based security. Each level of access to the application server can be assigned a name, called a role. Using the MTS Explorer or COM+ administrator, administrators can prevent clients from using an interface based on their role. (This is called declarative security.) In addition, however, programs can provide more fine-grained security programmatically. To do this, use IsCallerInRole to provide access to blocks of code based on the caller's security role. 

IsCallerInRole checks whether the current client is part of the role named by the Role parameter. It returns true if the client fits the named role, and false otherwise. Use IsCallerInRole to prevent clients that do not have the appropriate security roles from invoking certain blocks of code.

IsSecurityEnabled 

Using Transactional Data Modules