itsp/SAPjulep/MaxExModules is a SAP Parameter attribute which is used to control SAP Gui for HTML, maximum number of external modules 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 specifies how many modules (shared libraries) can be
loaded by sapjulep.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.