AppVar  Variable  Text

This command will append the Text you provide to the Variable. 

If the variable does not exist it will be created.

Note that you can not have a variable larger than the size of 
Gui4Cli's buffer (which, by default, is about 1000 characters).

You can increase the buffer size if you want with the "BUFFERS" Tool
Types option.

OR - use an env: variable and the APPEND command.

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  See also :
    Options               Variables