Chat without joining
If you have knowledge of more of those commands or about the ones with a question mark please leave me a note in the comments.
"/alertson text" sets the skype notification to occour on special text in messages. If an alert is set, every instance of the text will be highlighted in the chat window for easier detection of the alerting lines.
It's not a widespread knowledge that Skype has not only hidden emoticons (see also Skypes own emoticon list)but also allows some special commands within an open Skype chat. There are some lists available on the net but they aren't easy to locate and I found none which has a listing of commands.
Well, I don't know if I for myself have found all available commands, but none of the list contained all of those I know.
According to the Skype documentation the only effect is the "Creator" tag but I'm not so sure about that.
When this bit is off, new users cannot join the chat.
I didn't find so far a way to leave this mode again.When this bit is off, newly joined members can see chat history prior to their joining.This option has to be enabled before the options JOINERS_BECOME_APPLICANTS and JOINERS_BECOME_LISTENERS can be set.Also, this cannot be disabled while one of the JOINERS_BECOME_xxx options is still set.
So here I'm compiling my own list of Skype commands with descriptions and if you're interested some of the lists I used for this are at the bottom of this entry.Most of the commands are for administering the running chat, some are only available when you are the chat creator and some more only if you issued before.