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# LogiView

## Functions and Commands

| ## Input/Output
| The following functions and commands are available for data input and output:
ask | ask({VAR},{STR_EXPR}) This command is used to open a query form that requests the user for value entry. A free text string to be displayed as form text must be passed on to the command.
ask_mes | ask_mes({VAR}{STR_EXPR}) or ask_mes({VAR},{STR_EXPR},{EXPR_LIST}) This command is used to open a query form requesting the user for value entry. The form text message is defined in the "MESSAGE" DataView entity.
message_delete | message_delete() This command deletes the current messages in the Message window.
put | put({EXPR_LIST}) This command is used to display any expressions on the screen.
put_mes | put_mes({STR_EXPR}) or put_mes({STR_EXPR},{EXPR_LIST}) This command is used to display a message from the DataView entity 'MESSAGE'.