1BCursor(const void *cursorData)
2case 1:	cursorData is NULL =>
3	empty cursor object (useless)
4case 2: cursorData points to valid data =>
5	valid cursor object
6case 3: cursorData points to invalid data =>
7	empty cursor object (useless)
8
9BCursor(BMessage *archive)
10case 1: archive is NULL =>
11	empty cursor object (useless)
12case 2: archive points to a valid archive =>
13	empty cursor object (useless, R5 does not support archiving)
14
15static BArchivable *Instantiate(BMessage *archive)
16case 1: archive is NULL =>
17	returns NULL
18case 2: archive points to a valid archive =>
19	returns NULL (R5 does not support archiving)
20
21status_t Archive(BMessage* into, bool deep = true)
22case 1: into is NULL =>
23	returns B_OK
24case 2: into is a valid message =>
25	returns B_OK (archiving not implemented in R5)
26
27status_t Perform(perform_code d, void* arg)
28case 1: arg is NULL =>
29	returns B_OK
30case 2: arg points to something =>
31	returns B_OK
32