How can i edit aa table while running a script

I'm trying to make a script, to sort and calculate different data from a table. The user might have imported a table with errors, and i therefore try to give the option to open the table and edit it's data.

I try to use the openvar-command like this:

openvar('T')

where T is the tables variable name. When running it separately in the command window, the function works just fine, but when running the script, i do not get anything, just an empty window.

Is there another command i should use?