He provides two great tips for ABAP.
The first while strictly not ABAP but more SAP GUI related is related to removing the quick lookup entries from a drop down box. As Martin says:
I found out that in the SAP GUI, you can delete entries in the “recent values” dropdown of a field … by selecting it with the arrow keys and pressing delete.
This is very useful for getting rid of passwords typed in the username box.
As I shared this with one of my co-workers on my current project, she said “Oh yeah, you can do that anywhere, ie, anywhere”
So I confirmed that this tip also works in IE and mostly the browser of your choice too.