A CLNT command for the AVN model and a CLNT command for the MRF model can run at the same time, but two CLNT commands for the AVN model are run sequentially. This rule may not always be the optimal way for data to be transferred. To allow better control over how CLNT commands are run, we added the configuration variable, ALLOW_MULTIPLE_CLIENTS that will disable the single host/Message ID restriction. Instead of one command at a time the queue handler will execute MAX_SIMUL_CLNT commands at once.