Display activity messages

I'm writing a VBA program for MS Project. I use a screenwide form as "activity center", with commandbuttons and status display, that also stays on when the code runs on the background. How can I display on the form the status of various variables, like how many loops are made, number of records processed etc. during execution of the code? I guess I have to use textboxes, but how can I reinitialize them to show the ongoing values? Please help! Thanks.