Library /sys$common/syshlp/basichelp.hlb ON, GOSUB  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The ON GOSUB statement transfers program control  to  one  of  several
  subroutines, depending on the value of a control expression.

  Example

  150    ON Control% GOSUB 100, 200, 300 OTHERWISE 500

  Additional Information (explode) :

• Syntax