API Question

[Tim Hassan]

The function in vpopmail.h version 4.9.8:

int vadddomain( char *domain, char *dir, int uid, int gid); 

what does dir denote?
is it the domain's main directory? 

for example, if my code was like: 

ret = vadddomain(dom, something, VPOPMAILUID, VPOPMAILGID); 

what should I have instead of "something"? 

Any help is greatly appreciated. 

Tim