bgrfc/context_check/auth_check is a SAP Parameter attribute which is used to control activate authorisation check for RFC_CHECK_CONTEXT_ID 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 .
This parameter activates/deactivates the authorization check for the
function module RFC_CHECK_CONTEXT_ID.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.