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When you extend Esri's ArcMap with both an Extension, a Toolbar and a number of Commands, is the order in which these categories are loaded by ArcMap well-defined? (I.e. are Commands always loaded before Toolbars, Extension always loaded before Commands, etc.)

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In ArcGIS Desktop 9.x, I'm pretty sure it is Extensions, Commands then Toolbars. I'd have to check with 10.0 since they are using a different method for loading custom code (although it's prob still the same)'

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I'd recommend reading the "About extensions" topic in Extending ArcObjects | ESRI Developer Network (Wayback Machine link) which covers just-in-time extension loading. Ideally all extensions should be JIT extensions. Tools and commands can control the startup of a JIT extension etc.

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