I did up a basic script for it for VB 3.5 - and i think someone else did an excellent script for version 3 - has loads of options and is excellent.
Id like to add that digichat installs require root permissions on a server - so make sure ur hosting company will allow it.
The do host it themselves if needs be , and thats the option most use - for that there is really no limit to the amount of chatters.
https://vborg.vbsupport.ru/showthread.php?t=99029 Digichat integration on Vb 3.5
https://vborg.vbsupport.ru/showthread.php?t=83102 Digichat integration on Vb 3.0.x