Field Name	Description
FIELDNAME_LEN	Maximum length of a field name
PARAMNAME_LEN	Maximum length of a parameter name
MAX_SAPCOLUMN_LEN	Maximum length of a column or field
_rfcChNil	Null character
TRUE	Logical value for TRUE, equals 1
FALSE	Logical value for FALSE, equals 0
NULL	Value for a null pointer
MEMORY	A string indicating memory allocation failure

Define	Definition
BYTE	Byte is an eight-bit value, unsigned char
BOOL	Boolean type, int
CSTR	A constant string, const char