The <object> Tag

      <object classid="CLSID:XXX" width="320" height="256">
         <param name="name1" value="value1" />
         <param name="name2" value="value2" />
         [HTML TO DISPLAY IF OBJECT DOESN'T LOAD]
      </object>

Where XXX is the class id of the application you want to use to play the content.

You find the class id by opening registry editor, going to HKEY_CLASSES_ROOT and finding the application.
Windows Media Player:   MediaPlayer.MediaPlayer
QuickTime:QuickTime.QuickTime
RealPlayer:rmocx.RealPlayer G2 Control
Shockwave Flash:ShockwaveFlash.ShockwaveFlash

If this key has a CurVer subkey, find the (Default) value for that and that will tell you the key containing the class id.
Windows Media Player:   MediaPlayer.MediaPlayer/CurVer/(Default) = MediaPlayer.MediaPlayer.1
QuickTime:QuickTime.QuickTime/CurVer/(Default) = QuickTime.QuickTime.4
RealPlayer:rmocx.RealPlayer G2 Control/CurVer/(Default) = rmocx.RealPlayer G2 Control.1
Shockwave Flash:ShockwaveFlash.ShockwaveFlash/CurVer/(Default) = ShockwaveFlash.ShockwaveFlash.7

Then go to that key, and find the (Default) entry in its CLSID subkey.
Windows Media Player:   MediaPlayer.MediaPlayer.1/CLSID/(Default) = 22D6F312-B0F6-11D0-94AB-0080C74C7E95
QuickTime:QuickTime.QuickTime.4/CLSID/(Default) = 02BF25D5-8C17-4B23-BC80-D3488ABDDC6B
RealPlayer:rmocx.RealPlayer G2 Control.1/CLSID/(Default) = CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA
Shockwave Flash:ShockwaveFlash.ShockwaveFlash.7/CLSID/(Default) = D27CDB6E-AE6D-11cf-96B8-444553540000

Application Sample Code Result

Windows Media Player

Class ID:
22D6F312-B0F6-11D0-94AB-0080C74C7E95

Used for:
.wmv, .avi

Notes:

The application automatically grows/shrinks to fit the specified object width and height, although the video itself will not automatically grow beyond 100%.

"loop" is a cut-down alternative to "playcount". Use one or the other.
loop = false : equivalent to playcount = 1.
loop = true : equivalent to playcount = 0.
You can set "playcount" to 2, 3, etc., while you cannot get the same effect with "loop". 
<object width="320" height="256"
classid="CLSID:22D6F312-B0F6-11D0-94AB-0080C74C7E95">
   <param name="filename" value="1.avi" />
   <param name="displaysize" value="0" />
   <param name="autostart" value="false" />
   <param name="playcount" value="1" />
   <param name="showcontrols" value="true" />
   <param name="showaudiocontrols" value="false" />
   <param name="showstatusbar" value="false" />
   Object failed to load!
</object>
Parameters:
filename [the file to play in the application]
displaysize 0..3
autostart / autoplay true / false
playcount 0..99999
loop true / false
showcontrols true / false
showaudiocontrols true / false
showstatusbar true / false
Object failed to load!

QuickTime

Class ID:
02BF25D5-8C17-4B23-BC80-D3488ABDDC6B

Used for:
.mov, .mpg

Notes:

None 
<object width="320" height="256"
classid="CLSID:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B">
   <param name="src" value="ExploHead.mpeg" />
   <param name="href" value="http://quicktime.com" />
   <param name="target" value="_blank" />
   <param name="scale" value="tofit" />
   <param name="volume" value="10" />
   <param name="autoplay" value="false" />
   <param name="loop" value="false" />
   <param name="controller" value="true">
   <param name="starttime" value="00:00:06:00" />
   <param name="endtime" value="00:00:09:20" />
   Object failed to load!
</object>
Parameters:
src [the file to play in the application]
href [the link to go to when clicked]
target [the window to use for href]
scale tofit / aspect / [number]
volume 0..100
autoplay true / false
loop true / false
controller true / false
starttime [hh]:[mm]:[ss]:[frame no]
endtime [hh]:[mm]:[ss]:[frame no]
Object failed to load!

Real Player

Class ID:
CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA

Used for:
.rm, .rmj, .mpg, .mp3

Notes:

It seems you can't embed .ram files (which are lists of realplayer clips for continuous play).

You can use "numloop" instead of "loop". "loop" gives you the option of 1 play or infinite plays, "numloop" allows 1, 2, 3 and so on... but not infinite. 
<object width="320" height="256"
classid="CLSID:CFCDAA03-8BE4-11CF-B84B-0020AFBBCCFA">
   <param name="src" value="videotest.rm" />
   <param name="center" value="false" />
   <param name="maintainaspect" value="true" />
   <param name="autostart" value="false" />
   <param name="numloop" value="1" />
   <param name="controls" value="imagewindow,all" />
   Object failed to load!
</object>
Parameters:
src [the file to play in the application]
center true / false (stretch to fit if false)
maintainaspect true / false (only used if center = false)
autostart true / false
numloop 1..99999
loop true / false
console _master / _unique / [name]
controls Click here
Object failed to load!

Flash Player

Class ID:
D27CDB6E-AE6D-11CF-96B8-444553540000

Used for:
.swf

Notes:

None 
<object width="320" height="256"
classid="CLSID:D27CDB6E-AE6D-11CF-96B8-444553540000">
   <param name="movie" value="32volset.swf" />
   Object failed to load!
</object>
Parameters:
movie [the file to play in the application]
Object failed to load!

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