My macbook pro was not seeing my mini server through bonjour. An imac on the home network could see it just fine and the button was displayed on the finder window to allow Screen Sharing with it. The mini server is headless. Connecting through Command-K on the macbook let me mount drives, but I could not see the mini to allow screen sharing-the Share Screen button just would not show up. JellyVNC could not see the mini through bonjour (on the macbook) indicating a bonjour issue with the macbook that I do not know how to fix. However, manually setting up the mini’s server connection through JellyVNC allowed the macbook to connect and share its screen. No more relying on the button to show up in finder! Wish I had found this sooner as a use the mini to support an AppleTV for my music/video library. The interface is simple and easy and for me it just worked.