I know this may seem dumb, but can I install apps from memory card

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can I install apps stored as .prc's on the memory card, and if so how? Do I
need an installer prog?

the reason I ask is that sometimes applications fall over or require
removal/reinstall. If I can keep copies on the memory card and install at
will that would be great while on the move. Currently I reinstall from my
PC, which is not always convenient

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