getting fields from an application screen with VB

[kenpsalm19]

I need to develop a VB program that will capture the screenshot or read the
data on the screen of another running application, and then sends the
the read or captured data to the printer.
for example, a bank may want to send a customer's deposit transaction screen
to the printer as a teller that will be issued to the customer after the transaction. so i want a vb program that will get all the details on the banking application screen (i.e, Name, Amount, Date, etc) and send the details to the printer to be issued as a teller.Please i don't really know how to go about this