1 SEG$
 The SEG$ function extracts a substring (segment) from  a  string,  leaving
 the string unchanged.

 Example

 Center$ = SEG$(Alpha$, 15%, 20%)

2 Syntax

     str-var = SEG$(str-exp, int-exp1, int-exp2)

 The substring in str-exp begins with the character at position  int-exp1
 and ends with the character at position int-exp2.