Procman/HOS allocates temporary datasets on the system where it submits jobs (for JCL analysis, generation, checking or copying). The dataset name is built by appending the last qualifier to the prefix that is configured by base_tmp_dsn option.
In the sample below, all datasets created on DEMO_ID system start with P391D.HOS.DEMO.TEMP and datasets created on SYSH_ID system start with P391D.HOS.SYSH.TEMP.
This setting is valid for all clients (as there is an asterisk). You can replace it with a client name (and also add more clients) to have the prefix different for each client.