SYSNULL returns the system null pointer value. You can assign SYSNULL
to handles and compare it with handles. You can use SYSNULL to initialize
static pointer and offset variables.
![Read syntax diagram](./c.gif)
>>-SYSNULL--+----+---------------------------------------------><
'-()-'
Note: NULL and SYSNULL may compare equal; however,
you should not write code that depends on their equality.
See also NULL.