Sending textbox value to different form

I am trying to finish off my system, and this is the last part I need to do, I have 1 form which is a web browser and it has a textbox acting as the url input. When this is clicked on another form opens and this is a virtual keyboard with a textbox in this aswell. What I want to do is by pressing a button to send the contents of the keyboard textbox to the url box in the web browser.

I have tried searching to find snippets of code which could help me, and even tutorials aswell but none of them seem to be of any use, does anyone here have a clue where I could find useful information or even know how to solve my problem?
Without knowing anything about your project, I'll just respond the Windows API way: Use SendMessage() to set the textbox's text by sending the message WM_SETTEXT.
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