Problem with shell commands and scripts from an Applescript Application

Hi-
I am fairly new to OSX software development. I am trying to build an application that creates a reverse SSH tunnel to my computer and starts OSXvnc. The idea is that my Mom or anyone else who needs help can connect to me without having to tinker with their firewalls.
There are plenty of resources on how to do this, and I have found them. What I have a problem with is the following.
I am building this application in Xcode as an Applescript application, because Applescript and shell scripting are the only forms of programming I know. I use an expect script to connect through SSH, and a "do shell script" for the raw OSXvnc-server application to allow screen sharing.
The problem is that when I click on the button to launch OSXvnc-server or the button to launch SSH, the application freezes until the process it spawns is killed or finishes. For example, I can set SSH to timeout after 60 seconds of no connection, and then the Applescript application responds again. I even tried using the ssh -f command to fork the process, but that doesn't seem to help.
I am also using "try" around each of the items.
What am I doing wrong? How can I make the buttons in my app launch SSH and OSXvnc-server without hanging the application while it waits for them to finish?
Thanks so much!

See here for an explanation of the syntax.
(20960)

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Problem with shell commands and scripts from an Applescript Application

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