enque/process_location is a SAP Parameter attribute which is used to control Communication between work process and 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 .
Specifies the type of communication with the enqueue server. You can
choose whether:
Communication always takes place using the message server
(REMOTE_TASKHANDLER)
Communication always takes place locally (LOCAL)
The appropriate communication type is to be selected, depending on
whether the work process is running on the central instance or not
(OPTIMIZE). This is the default setting and should not be changed.
Caution
If you are using the standalone enqueue server, this parameter must be
set to the value REMOTESA.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.