/sys$common/syshlp/helplib.hlb Sys Parameters, PQL_MASTLM  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    PQL_MASTLM sets a default limit on the minimum number of pending
    ASTs for a process created by the Create Process ($CREPRC) system
    service or the DCL command RUN (Process).

    PQL_MASTLM has the DYNAMIC and GEN attributes.