dynpro/global_fields is a SAP Parameter attribute which is used to control Enables/disables the usage of global fields. 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 'Global fields' function is not normally active, the parameter is
set to 'NO'. The documentation for transaction SHDG provides the details
of this function. If you need to use the 'Global fields' function, you
must proceed as follows:
Create and maintain table SHDGV with transaction SHDG.
Set the profile parameter dynpro/global_fields to YES.
Restart the system.
The 'Global fields' function is now active.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.