Up to version 4.6.1, TLXOS used TurboVNC rather than SSVNC as its VNC client.
We switched to SSVNC after a customer informed us of a compatibility issue
between TurboVNC and certain VNC servers that resulted in loss of keyboard
input.  SSVNC also supports the ZRLE and ZYRLE encodings used by RealVNC, which
TurboVNC does not.