If OPGS runtime is installed in \usr\g5g :
set OPGS_HOME=\usr\g5g\OPGS
2) Copy the OPGS DLLs (in the lib directory) at the executables location or in the Windows version 3.1 or or
Windows for Workgroup or Windows NT system directory. This is necessary if your application is in DLL version.
3) Run now your application