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NQ_Mfs ($8900), read free space information (system use only)
NQ_Slt ($8903), read slot type information (system use only)
NQ_Mfp ($8906), get total of free RAM pages in slot (OZ 4.2 and newer)
NQ_Mup ($8909), get memory used in pool (OZ 5.0 and newer)
NQ_Mnt ($890C), fetch mount status (OZ 5.0 and newer)
Director and CLI
NQ_Dev ($8C00), fetch current device
NQ_Dir ($8C03), fetch current directory
NQ_Fnm ($8C06), fetch current filename match string
...