Command Usage

Hi Guys,

I am not able to understand the meaning of command 

*mergehistorystate "" ""

in TCL/TK. I searched on the internet but still I didn't understand why it is used for. I found this command in command.tcl file on hypermesh when I was splitting the surface by nodes. If anyone knows about it, please help me with this.

Your help is much appreciated.

Thanks and regards.