DMP 4400 Browser Command for refreshing Currently Playing URL

Looking for a "SET" command that will allow me to refresh the "Currently Playing URL" without rebooting the DMP.
I need a refresh BROWSER URL command so that Users do NOT have to repush unique individual Presentations when making a change to a shared / referenced Playlist, but rather have the ability to select a single System Task that would issue the refresh Browser URL command.  
I'm aware of the following command, but this requires the specific URL to be known, which defeats the purpose of having a general URL refresh command:
http://<dmp_ip>:7777/set_param?mng.command=start+video+<URL>
Anybody know if other param / syntax options exist for accomplishing this task?

Hi Mark,
I went as far as disassembling the sysmng binary and I found a number of features I hadn't known about the existence of before, but nothing that I can clearly identify as causing a refresh.
I've been trying to get my hands on a development reference or something because there are probably more than 100 functions and I only know what several dozen of them do. Then there are differences between the 4310/4400 presentation mechanisms. Sounds like I need to power on a 4400 and poke around at it.
The approach we're using on the 4310 is to load a local page stored on the DMP in file://tmp/ftproot/usb_1 , and that happens to be a .swf flash template that listens to remote commands to refresh or reload or do whatever we want to it. We control it as an interactive function of the .swf itself rather than via sysmng commands.
So for us, the second command below to reload always points to the same file://xxxxx path and we don't need to independently determine the playback URL.
Another idea would be to point the playback URL to file://xxxxxx/file.html and have that frame or refresh external content. But then you would have to manage "file.html" on the DMP and execute the second refresh command below. You say that server side execution isn't going to work for you, but perhaps scp/sftp of a file containing the presentation URL would work for you instead?
Or... say, using the sysmng function to execute a wget command, to stage file.html on the DMP's file system? Have never tried that but that goes to illustrate that there are a lot of different ways to accomplish something on the player.
If I find a better answer about a built in function being a /better/ way to accomplish that (or if I stumble on something unique to the 4400) I will let you know.

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