Special entries in the operand form

The default values preset in the input lines of the operand form can either be accepted or overwritten with user-specified values. Any value already set must be completely overwritten when entering a new operand value. Any characters not overwritten by the new value must be erased either using the LZF key or by overwriting them with blanks. If a list of operand values is entered (list-possible), the parentheses may be omitted.
Further entries are possible:

?	as an operand value calls up a help text and a display of the range of values for the relevant operand. If SDF has displayed the message “PLEASE CORRECT THE INCORRECT OPERAND(S)” after an incorrect input has been made, the question mark calls up detailed error messages in addition. The remainder of the line need not be deleted.
??	as an operand value supplies information on the data types permitted as an operand value. The remainder of the line need not be deleted.
!	as an operand value inserts the default value for this operand (this is important if the default value preset in the form has been overwritten). The remainder of the line need not be deleted.
^	as an operand value of a “secret” operand requests a blanked input field for confidential entry of the operand value.
([<operand>,...]	following a structure-initiating operand value displays the subform for the associated structure. It is preset with any operands entered after the open parenthesis.
([<operand>,...])	following a structure-initiating operand value suppresses the subform and inserts the default values for any operands of the structure that are not specified.
-	as the last character in an input line causes SDF to display a continuation line.
	deletes all characters in the input line from the cursor onwards (LZF = abbreviated German for “delete character string”).