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Yes, you can add a function to your screen script. This means it is hidden from all other screens and only accessible to the screen object itself.

The format is    

     MyFunction : function (parms) { logic } ,

...

And it is invoked by    

     this.MyFunction(parms);

...

Put the function before the <SYSINFO> block. Note trailing comma.

Alternatively, you can add a function to UF_VFSY40_RTS,JS and then is accessible to all screen objects. By passing your "this" reference to the function, it can generically act on behalf your behalf. See User-Defined Script Functions.