Library /sys$common/syshlp/pca$help.hlb SPAWN, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The SPAWN command acts the same as the DCL SPAWN command. You
    can use it to break out of the PCA session to edit files, to
    read mail, or to do any other tasks you would normally do at DCL
    level, all without ending your PCA session.