The ISCNTRL() function will check that the expression consists entirely of control characters. It takes the general form:
The expression can return a result from any type. The ISCNTRL() function will then return TRUE (1) if the expression consists of entirely control characters. The function will return FALSE (0) if the expression contains any characters, which are not control characters.
When the ISCNTRL() function is used in International Mode the properties of each character is determined according to the Unicode Standard.
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