Running macros automatically

Is it possible to get macros to run automatically everytime the document is opened?

Is it also possible for macros to run automatically everytime something in the worksheet changes?

Is it possible to get macros to run automatically everytime something in a specific range of cells changes?

Is it possible for macros to run automatically every 30 seconds or one minute?

If the answer to any of these is yes, I would like to know how its done.

Finally if I have a lot of macros running automatically everytime say something in the worksheet changes, will everything be running slower?

Thanks for the help

Hi, the answer is yes--the link below should get you started:
http://www.cpearson.com/excel/events.htm

HTH--Lonnie M.

>Is it possible for macros to run automatically every 30 seconds or
>one minute?

See the 'OnTime' function VBA help and the link below should help:
http://groups.google.com/group/micro...=ontime&qt_g=1

HTH--Lonnie M.

Thanks for the help