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You can use conversation security to require that the invoking TP provide a user identifier and password before APPC will allocate a conversation with the invokable TP. If security is activated, the invoking TP must supply a combination of the user identifier and password as parameters of ALLOCATE or MC_ALLOCATE. Conversation security is activated and configured through registry or environment variables on the computer where the invokable TP is located.
With communication involving more than two TPs, the verification of a user identifier and password can be passed from one TP to another. Suppose that TP A invokes TP B, which requires security information, and TP B in turn invokes TP C, which also requires security information. Through ALLOCATE or MC_ALLOCATE, TP B can inform TP C that conversation security has already been verified.
For information about the registry or environment variables affecting conversation security, see Configuring Invokable TPs.