In order to run Ext API applications on Windows, it is necessary to set the
          
ALTAIR_HOME environment variable to the 
HyperWorks install location. For paths with spaces, do not use quotes.
        For example:
ALTAIR_HOME=C:\Program Files\Altair\2021\hwdesktop\
In order to run Ext API applications on 
Linux, the required
          
HyperWorks environment is setup by the
          
ALTAIR_HOME/altair/scripts/hm_extapi link. The following syntax can
        be
        used:
hm_extapi <application> <arg1> <arg2> ... <argN>
It is often necessary to set the 
HM_OGL_STUB environment variable to
        1. This disables OpenGL commands on machines where there is no graphics card. If necessary,
        this should be defined before running 
hm_extapi as described above. For
        example:
setenv HM_OGL_STUB 1
hm_extapi <application> <arg1> <arg2> ... <argN>