execute "conf qa" or ":conf qa"

Hi,

It seems that sometimes I see cmds in an execute statement without a leading colon, as in:

execute "conf qa"

And sometimes I see the colon, as in:

execute ":conf qa"

Is there a rule or reason why ? Just wanting to understand it properly.
I would have thought I need a colon always since I had thought the execute was being performed in 'normal' mode. But it seems to work without the colon, at least in some places.

thx as always,
mark

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