There is no "Central Management" software available in Abacus to perform the kind of assigning and co-ordinating resources for multiple users.
Abacus allows multiple users to log into the system and acquire the resources they need for their tests. Other than the System Controller, the resources (the Call Generator cards) are dedicated to individual users who acquire them and will not be shared. Each of the users is independent of others, hence they have the flexibility of configuring their own tests. The price of having this flexibility is a possible conflict of resources in the network. Users have to reconcile their usage of network resources before running their own tests.