The control and command keys are basically analogs when it comes to computer applications, when I'm talking about them in a cross-platform application, what should they be called? Is there a term like " the _______ key"?
Alt / Shift / Control / Command - they're all modifier keys. Ctrl/Command are analogs in the sense that they're used for "command"-type shortcuts, i.e. performing some action. Maybe a C-modifier key or action-modifier key would be the right names.