use the standard SAP search help for your own input fields defined by InputField
for example, to search for customer numbers, purchase orders, materials,
When defining the input field, use techname= to refer to the technical SAP name of a field whose search help you want to use, or use searchhelp= to specify the name of the search help directly (according to SAP transaction SE11). Example:
InputField (10,1) "Currency" (10,12) size="3" name="xcurr" techname="BKPF-WAERS"
The F1 help is also automatically available by techname=: