We call the transfer an "upload" when you send a file to CCN (the host) and you "download" from CCN (the host) to your own machine.
It is most usual to use the d command for downloading a file selected in the file browser.
It is possible to transfer a file directly to your computer screen or your printer (if your communications software is configured properly and the printer is turned on). The p command presents these two options with respect to printing the currently displayed document.