icetIsEnabled -- query enabled status of an IceT feature.
GLboolean icetIsEnabled( GLenum pname );
Returns ICET_TRUE if the feature associated with pname is enabled,
ICET_FALSE $(= 0)$ if the feature is disabled.
If pname is not a feature to be enabled or disabled.
The check for a valid pname is not thorough, and thus the
ICET_INVALID_VALUE error may not always be raised.
A list of valid values for pname is given in the documentation for
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IceT Reference November 15, 2006 icetIsEnabled(3)