Download manager related

Force IDM to merge/join incomplete download parts
Pause then resume then stop download
Then check temporary directory (Download \ Options \ Save to)

IDM vs FDM: Which is the Better Downloader?
In ... IDM allows you to limit the speed for a individual downloads
Refreshing Download Links:
Using refresh download links, you can request the file again and IDM will catch the download and resume it from wherever it stopped.
While you can schedule downloads in FDM, it’s nowhere near as powerful and versatile as IDM.
If you are using FDM you will not need a separate torrent client, as the built-in client is more than capable
Another nice feature of FDM is a recycle bin for downloads

Download from share sites using IDM:
QUESTIONS ABOUT SPECIFIC SITES RAPIDSHARE, MEGAUPLOAD, HOTFILE AND OTHERS

How to play videos while Downloading with IDM (Unfinished download)
1. Open Your IDM interface.
2. Click Options.
3. In Internet Download Manager Configuration box click Save to tab.
4. Under Temporary directory section you will see the path of temporary folder of idm where all parts get stored while downloading a file.
5. Copy the path.
6. Go to Start->Run and type the path and click OK. Or you can follow the path. The path should look like C:\Users\Your user name\AppData\Roaming\IDM\
7. Then open DwnlData->Yourusername folder.
You will see all your temporary folders of IDM download. Open the folder of the video file and play the video with VLC media player. I recommended VLC media player.
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Issue:
Each time FDM is restarted, incomplete download(s) are missing from the list.
Re-create download will not resume partially-downloaded file on disk.

Solution:
Exit FDM and clear download history by deleting .sav files on this folder:
Documents and Settings\\Application Data\Free Download Manager\