18.4.2 Dynamic String Descriptor Format
  A dynamic string descriptor consists of two longwords.

  The first word of the first longword contains a value
  equal to the string's length. The third byte contains 14
  (0E hexadecimal-the OpenVMS code describing an ASCII
  character string). The fourth byte contains 2.

  The second longword is a pointer containing the address
  of the string's first character. See Figure 18-7. For more
  information, see the OpenVMS Calling Standard.