rdisp/enqname is a SAP Parameter attribute which is used to control Name of the Enqueue Server 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 .
Name of the application server that provides the enqueue service. This
parameter should not be set by default because:
Either the standalone enqueue server is used (recommended
configuration), or
The application server determines the enqueue server automatically.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.