Batch Tool and Get String

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Hello all,

Thanks in advance for your help.

Function

I would like the user to insert a project Path via the GET STRING prompt. I would like this prompt to be executed once at the beginning of the Batch Process. The next time this macro is executed, alone or in a Batch Process, the old information should not be contained. 

Problem

1. Check if the GET STRING global variable is empty at the start of the Batch Process. 
2. Execute the GET STRING command once at the beginning of a Bath Process.
3. DISPOSING of the GLOBAL variable at the end of the Batch Process.

Progress

I have managed to assign the GET STRING to a GLOBL variable.

Alternative

Manually change the macro everytime a new path is required - already exists.

Thanks

Alan