control a jack/cylinder to open/close a window I want to open the window to let the cat enter or go out, but the mecanism of the window may me think that the best way should be to use a jack/cylinder (I don't know what term is more appropriate in english for that) to open and close the door.

I will use rfid or another wireless think to know it the cat is in the place and then open the wondow but I want to close the window and let the wndow close event if there is little bit of wind, so I need domething robust.

Do you know a good hardware with (this would be the best) piece of code that can help me for that?

Thanks in advance
Check out this instructable - for opening a window for a cat :)
The guy used a servo, Towerpro MG995 with 10 kg torque for opening/closing the window, and a 10cm distance sensor for sensing the cat (he used Pololu Carrier with Sharp GP2Y0D810Z0F Digital Distance Sensor, but I believe that any proximity sensor will do). 

This is a pictrure of the mechanism, seems quite robust: