In a multiple-system environment, you will use the CA-L-Serv communications server to enable client applications running on remote systems to access the files managed by the host system. The file server and the communications server must run in each copy of CA-L-Serv.
A typical implementation involving test and production copies of CA-L-Serv running on two Z/OS images is represented by the following graphic:

In the previous example, each copy of CA-L-Serv runs its own communications server. However, a specialized CA-L-Serv started task can provide communications services for multiple copies of CA-L-Serv.
The following graphic illustrates this scenario:

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