Hi Kanbar,
Does xvnc supports clipboard functionality (I need to copy between> Windows and Eclipse on linux and vice versa and not with a X app)
While this does not answer your question directly, you might find that
using NX/FreeNX would give you all the functionality you need, including
copy buffer sharing beween local and remote machines. There are fairly
comprehensive details on howto setup freenx on centos4/5 in the centos
wiki ( wiki.centos.org )