[Serusers] SEMS

i wish happy new year to everybody, i have to admit that i am quite new to ser community, and right now i am trying to find out some things about sems... I know that for some members, these questions seem "stupid", but i need some help... Reading the README - INSTALL files of sems, i couldn't figure out some things (having in mind that for the moment i want a server on my computer that could handle voip calls including video conferencing , announcement and some other simple thing. .....simple :) ) i have downloaded the sems-0.10.0-bundle.tar.gz ------> Do i have to run 2 instaces of ser on my machine, and if yes, the first will be configured via ser.cfg that is located in a directory, the second will be configured via its ser.cfg in an other directory??? and the file ser-sems.cfg ???