warn if routine is open in another location

similar to opening a word doc or protected pdf  or cad file, where an instance of that file is already open at another pc or workstation, and a warning pops up that it can only be viewed not edited since it is open somewhere else.  This would come in handy when, programmer needs to make edits, but in another facility the routine is open and running at a cmm. Rather than messaging folks or emailing and waiting for a response and someone to physically go verify it is not open anywhere, to just have a warning message pop up instead.