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

  The SET VIEWPORT statement allows you to change  the  section  of  NDC
  space to which an image in the world window is mapped.  A SET VIEWPORT
  statement implicitly  establishes  the  current  transformation.   The
  default viewport is the entire NDC space with boundaries of 0,1,0,1.

  Example

  !Map all of window to top right corner of NDC space
  SET VIEWPORT , TRAN 2 : 0.5,1,0.5,1

  Additional Information (explode) :

• Syntax