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Historically us Fortan programmers built systems from subroutines and libraries linked by COMMON blocks and argument lists
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Languages like Java support this type of linkage with some changes through methods.
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COMMON blocks have almost gone ....
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However there are other features in portal programming
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portal components tend to be distributed and loosely coupled
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Fortran main and subroutine doit were tightly coupled on the same machine
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Linkage between portal components is often best done through event signals with listeners and observers
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This is slower of course but supports necessary asynchronous linkage and acceptable in most cases
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