descriptor-count-value

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       read only
    mechanism:    by value

    Number of adjacent descriptors to be flagged as having no
    allocated area (the descriptor's POINTER and LENGTH fields
    contain 0) and to have their allocated areas returned to free
    storage by OTS$SFREEN_DD. The descriptor-count-value argument is
    an unsigned longword containing this number.

 first-descriptor

    OpenVMS usage:quadword_unsigned
    type:         quadword (unsigned)
    access:       modify
    mechanism:    by reference

    First string descriptor of an array of string descriptors. The
    first-descriptor argument is the address of the first string
    descriptor. The descriptors are assumed to be dynamic, and their
    class fields are not checked.