I am also really very much intrested in developing applications in X Windows environ. Are u a beginer or advanced developer in it. Out of few applications I have developed in X I found it to be very handy and helpful basically because of its portability accross Unix.
To start with shall we take initiative of discussing basics of X Windows concept Developing apps in X has proven to me to be very helpful in developing applications on VTCL also.

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Regards,
Satya Prakash Prasad