The following screen shows a typical downloading in progress.

The context menu in the search window (right click on a selected user) offers more information regarding a user who is offering files to download as shown below.

Download.
This option starts the downloading process of the selected file and displays the Transfer window.

Manually Download.
WinMX will prompt you for some manual options before starting the downloading process.

Download Group.
A group is a collection of files with similar or slightly different file names but WinMX knows that their contents are identical. Select this option to download from all available users instead of the first one found.

Collapse.
This option collapses the display of a downloaded group.

Browse.
This option displays all shared files this user has to offer. It may be a good idea to see how many files there are by doing a Whois first. Some users offer tens of thousands of files so the display can take some time. This is a good option to see if the user has good, quality contents and he/she falls into your category of interest.

Add To HotList.
If you find a favorite user or a new friend on the networks, you can add his/her screen name to the HotList window.

Whois.
This option provides a brief summary of the selected user. For example,
User Name: Thanks-4-Sharing289_14538
Connection Type: Cable
Files shared: 454
Elapsed time online: 11:54:13
Transfer Status: 99 in queue (0 of 1 available)

SendMessage.
You can send a message to this user. However, it is not guaranteed that the user will respond, read or even receive your message.

Chat.
You can open a chat window with a user you know.