I'm looking for a way to run a loop in TCL shell background (meaning - an infinite loop calling some function), but I can't find a way to do it.

The proc is a simple proc releasing all possible licenses from the user (we have a shortage of licenses here at work and we constantly fighting who's going to get them).

The loop itself is simple: 

```
while {1} { 
      after 60000
      clr_lic
}

```

But how can I make it run in the background so I'll be able to run other commands as well?