icf/user_recheck is a SAP Parameter attribute which is used to control Recheck user by following requests in stateful HTTP communication 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 .
The parameter defines if a new logon data check and addressing of an
existing session is to take place for stateful HTTP communication or
not. The authentication data needs to match the data held in the
session.
0 =
If the check is inactive
1 =
If the check is active
See SAP Parameter Documentation for full SAP documentation for this profile parameter.