the bottom text field at the top of the script process contains the MD5 checksum of the script file in the file path box above it.
an MD5 sum is a "hash", sometimes called a digest, or a summary, which is a large-ish number that tries to uniquely identify a much larger number or collection of numbers (like a text file, or any file on the computer which behind the scenes is just a long list of numbers.) the point being that if you change just one byte or even one bit of the underlying file, the MD5sum will be a completely different number. this lets you identify that a file has been changed in some way. for instance a software installer might come with the MD5sum of the installer file. you download the file and then run the md5sum program on your end, and if you get a different number, then someone has tampered with the original installer.
PI tries to check the script on disk against the MD5sum it calculated the last time it ran the script to help you check if somehow the contents of the script have changed. but you can override the check by clearing out the MD5 box by clicking the little tab with the X.
rob
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