Tip when working with small detail on large item

While drawing a large item (4.5m long x 3.1m wide x 1.8m tall) with small
detail on it (like a 10mm dia hole on a 60mm x 30mm tab) I found it very
useful to open two windows on the same item but showing different views or
zoom settings on each. 'Arrange' the windows 'Vertical' and I could work
quite well. Many commands could be used across both windows. Rick B.'s
advice about clicking the RMB after completing a zoom operation to 'unstack'
the zoom command and return me to the previously active command was also
very useful - I didn't lose the initial tool when zooming or moving within a