I'd appreciate if someone could help me in understanding some technical aspects about Nokia Presence Server (IMPS)....

1) Can Nokia Presence Server serve also PC-based client? Or it's limited to mobile device?

2) I manage a IM server for PC-based client. Now I'd like to include mobile domain... is more convenient for me to substitute my IM server with Nokia Presence Server to serve both mobile and fixed clients or it's better to maintain Nokia Presence server and IM server communicating throgh SSP/HHTP?

3) Can Nokia Presence Server Database be queryed DIRECTLY or the only way is using API?

thanks in advance for all the informations