You type /help file server and scroll down to the second section.
File Server
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Fileserver commands
The commands availabe to a user connected to your fileserver are:
cd <directory> - change to the specified directory.
dir [-b|k] [-#] [/w] - lists the name and size of each file in the current directory. The /w switch forces a wide listing. The [-b|k] selects bytes or k's. The [-#] specifies the number of files on each line in a horizontal listing.
ls [-b|k] [-#] - lists the name of each file in the currenty directory using a wide listing.
get <filename> - asks the fileserver to DCC Send the specified file.
read [-numlines] <filename.txt> - reads the specified text file. The user will be sent a default of 20 lines and then prompted whether to continue listing. The -numlines option changes the default number of lines to a value between 5 and 50.
help - lists the available commands.
exit or bye - terminates the connection.
Note:
1. If a directory has a large number of files try to split them up into subdirectories, this will improve performance.
2. If a user is idle for too long the fileserver will automatically close the connection. You can set the idle time out in the DCC Options dialog.
3. A user is limited to opening a single fileserver session at any one time. If mIRC initiates a fileserver session to a user and that user doesnt respond then the fileserver session will have to time-out and close before that user can ask for another session.