I would like to be able to decide at run time which of several subs to
call and, when writing the code, it may be impossible to even know the name
of the sub.

That is, I cannot use code like:
if i 5 then
call This()
else
call That()
endif

because I have no idea what the names of "This" or "That" may be.

I would like to do something equivalent to:
Sub MyCode(SubName as WhateverIsNeeded)
Call SubName
End Sub

Thanks for any help.