The complete question was:

"How dou you customize your stereo parameters (stereo angle separation, depth etc.) on an INDIGO and/or ESV with STEREOGRAPHICS glasses ?"

SGI: pressing F12 will tell you that you can use the arrow keys for this purpose

ESV: stereo users should see a motif widget that allows them to modify the stereo settings when they first swap from mono to stereo. If you kill the widget and then want to change the setting, as far as I recall, you can go to mono and it reappears when you go back to stereo. As in the SGI version, the settings are not saved at present.