Integration with POS

Hi community,

I created a custom button called Print to POS in SalesInvoice. when i click this button from client machine, it should collect some information from the invoice (like customer name, address, Tin no, Item code, Item name, Quantity,price, discount, vat etc) and write it to a text file on a client machine let say to a destination D:\POSfolder\posfile.txt.
can any one help me in creating this custom script.
Thanks in Advance



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