What is search help ? Types of search help ?- in SAP ABAP

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SEARCH HELP and TYPES OF SEARCH HELP: The search or input help[F4] is a standard function of the R/3 system and the user can display the list of all possible input value for a screen field with the input help.

 There are 2 types of search help
1.) Elementary Search Help.
2.) Collective Search Help.

 1.)Elementary Search Help : It describes search path that it must define where the data of the hit list should be read from,interface of search help and online behavior of search help.

 2.)Collective Search Help : The Search help that combine several search path are called collective search help.

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