I think this is normally called right-justify-zero-fill:

I usually define a local function, such as:

rjzf(num,wid) Quit $Translate($Justify(num,wid)," ","0")

USER> w $$rjzf(1,4)

0001

Daniel:  Is there something wrong with the contact page on CacheQuality.com?  I tried submitting a message and it responds with an error message about only wanting humans contacting them.  I'm trying to decide if I should be insulted.