frank.etzenbach
You will have many questions using sme server, so PLEASE learn to use the Search link located at top of Forums, as many questions have already been answered
eg search on
show open files
found this (& many others)
http://forums.contribs.org/index.php/topic,50118.msg251530.html#msg251530which suggests to use the command
smbstatus
& a search on
show logged in users
found many results also
one of which suggested to use the command
last
There is also a very useful link to the FAQ at the top of Forums, which has a lot of commonly asked questions & answers, so please take a look at the FAQ.