Sbot = 15 clients/2 computers.
SbotModCL = 8 clients/clientless/2 computers.
It means if you want to share sbot alone with ur friend you can both play 15 chars, but if you will share with him SbotModCL you can both play still 15 chars but you can go CL only on 8 of them, cuz you can start only 8 Sbot's with the mod. 4 ur friend and u 4 or 6 u 2 ur friend etc.