Ocx ?

I want to be able to send keys to a Citrix app...
I have tried sendkeys function and that doesn't work.
I did see that citrix does provide a "Wfica.ocx" file
...I never used ocx files but Can I use that to send
tabs,enter and paste to the Citrix App...

Probably not no. The OCX is most likely a control used by the Citrix app. You could try to use it in VB, but you'd probably be breaking some laws.
Try using the SendMessage API to send the keys instead.