Concat                         Concatenate two or more strings
 Copy                           Create substring from existing string
 Delete                         Delete substring from string
 Insert                         Insert substring into parent string
 Length                         Returns length of specified string
 ParamCount                     Parameter count in command tail
 ParamStr                       Return specified command tail parm
 Pos                            Returns position of string in string
 Str                            Converts numeric value to string value
 UpCase                         Convert character to upper case
 Val                            Convert string to numeric value