rdisp/max_vm_priv_no is a SAP Parameter attribute which is used to control information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
If a session of the VMC (Virtual Machine Container) exceeds a certain
size, it is stored in the VM local memory. This means that the VM can no
longer be used for other users. You can use this parameter to configure
the maximum number of private VMs of this type. If this number is
exceeded, after a certain period of time (see parameter
See SAP Parameter Documentation for full SAP documentation for this profile parameter.