How do I check which version of openGL I got installed?

Where or how could I check which version of openGL i got installed? Is there any utility I could get that would show me what version I got?

Also is there any way of installing the latest openGL drivers for a TNT without also installing the Detonator drivers? I got an Asus3400TNT and I like Asus-native drivers better for my slightly aged card (: . Or Do the asus-drivers also come with the latest openGL drivers? Anyone?