Multiple username's on PM?

[xXLeighXx2008]

I have a link that when pressed, it will send a PM to 2 admins (user id 1 and 42)

How do I do this?

I know for 1 user, its private.php?do=newpm&u=1

how do I do it for 2 users

[Dismounted]

https://vborg.vbsupport.ru/private.php?do=newpm&u[]=1&u[]=42

[xXLeighXx2008]

Thanks!