AVI MPG RM Video Joiner is a powerful tool to join multiple AVI, MPG, RM together into a large video file. it also support join MP4, Divx, XviD, MPEG, ASF, MOV, 3GP files into one large file. with this AVI MPG RM Joiner, you can even join AVI, MPG, RM together and save them into VCD/SVCD image and DVD-Video files (VOB files), so you can burn them into one VCD/SVCD/DVD disc easily. If you want to burn them into DVD disk, I suggest you use Imtoo DVD Creator
Ultra MPG joiner is such a MPG joiner that you can join MPG video files together with other video files (such as AVI, Divx, XviD, MPEG, WMV, ASF, RM, MOV, 3GP, MP4 formats) into a large mpg video file. with this MPG joiner, you can easily merge them into AVI, MPEG, Divx, XviD, VCD, SVCD, DVD, WMV formats. As the operation of Ultra MPG joiner is similar with AVI RM MPG joiner, so in the guide, I only Take AVI RM MPG For example.
Guide: How to use AVI MPG RM Joiner Step 1: 
Free download AVI RM MPG Joiner and install it on your computer.
Step 2:Click 
Button to select the video files you want to join
Step 3:Edit the source video files, if you like.
Click
button to edit the selected file, you can set the start time and the end time.
Step 3, Sepcify the directory for output files by clicking the 'Change...' button, or just use the default directory (Note: after successful join, pls click Open button to find where the file stored, if u try to find the converted file via other way, you may can not see the joined file)
Step 5, Sepcify other settings for advanced user, you can set output quality, frame rate, TV type, Aspect Ratio, Add letterbox and so on.
Step 6, Click
Button to join the MPG video files.
After successful join MPG video files, the joined video files shall be stored in the folder you have previously selected.
Convinced? 
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The operation process of UltraMPG joiner is quite similar as the guide above, just free download them and enjoy by youself.