wdisp/HTTP/max_session_tab_logon_groups is a SAP Parameter attribute which is used to control Maximum number of different logon groups for external session id or js 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 .
Maximum number of logon groups that the Web Dispatcher supports. Here
only the logon groups for which the Web Dispatcher actually gets
requests are considered, rather than all the logon groups configured in
the system.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.