vnc for Android is an application that connects remotely to most vnc servers as Tight vnc, RealVNC on Windows, Linux and Apple Remote Desktop on OS / X directly from your Android smartphone.

To use the software, just enter the parameters for connecting to remote computer: alias, password, address, port and color modes.

While connected, you can send text, resize the page and select various modes of entry such as:

vnc * Overview cursor touches and larger;
* No cursor, mouse, trackball;
* Mouse pointer control mode
* Cursor touches; trackball mouse
* Cursor touches; panoramic d-pad

More detail from here Secure connections with Ultr @ VNC
Read related article at VNC for Android