The Put String to Common routine copies the contents of a string
    into the common area. The common area is an area of storage
    that remains defined across multiple image activations in a
    process. Optionally, LIB$PUT_COMMON returns the actual number
    of characters copied. The maximum number of characters that can
    be copied is 252.

    Format

      LIB$PUT_COMMON  source-string [,resultant-length]