{ni}KREALTIME(0;K==>c) - Lock in memory

- If K is a read-write page key or a node key and the total
number of pages or nodes locked is below a kernel defined
limit then the page or node designated by K is locked into
real memory (the kernel will not replace it with another
page or node) and c is 0. If K is not a read write page
key or an node key then c is KT+3. If the kernel limit is
exceeded then c is 1.

- If K is a read-write page key or a node key then the
page or node designated by K is unlocked from real memory
(it may be paged out) and c is 0. If K is not a read write
page key or an node key then c is KT+3.