INPUTS

pos1
- number of the first entry.
pos2
- number of the second entry.

Possible special values since muimaster.library V9:

MUIV_List_Exchange_Top 0  
MUIV_List_Exchange_Active -1  
MUIV_List_Exchange_Bottom -2  
MUIV_List_Exchange_Next -3 /* only valid for second parameter */
MUIV_List_Exchange_Previous -4 /* only valid for second parameter */