Using something other than netsend

[NU2VBPGMG]

I am very new to VB6, and have developed a small program where by clicking a button it would execute a bat file which contained a netsend string to send a network message. However, do to changed network requirements, I need to change the functionality where it does not use netsend. Is there a way to code it where it utilizes Active Directory to send a message across the network and only be contained within a certain area of a domain? Any help or pointers in the right direction would be appreciated.