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    <p>You should regard .h files as <strong>interface files</strong> of your .c file. Every .c file represents a module with a certain amount of functionality. If functions in a .c file are used by other modules (i.e. other .c files) put the function prototype in the .h interface file. By including the interface file in your original modules .c file and every other .c file you need the function in, you make this function available to other modules. </p> <p>If you only need a function in a certain .c file (not in any other module), declare its scope static. This means it can only be called from within the c file it is defined in. </p> <p>Same goes for variables that are used across multiple modules. They should go in the header file and there they have to marked with the keyword 'extern'. Note: For functions the keyword 'extern' is optional. Functions are always considered 'extern'.</p> <p>The inclusion guards in header files help to not include the same header file multiple times.</p> <p>For example:</p> <p>Module1.c:</p> <pre> #include "Module1.h" static void MyLocalFunction(void); static unsigned int MyLocalVariable; unsigned int MyExternVariable; void MyExternFunction(void) { MyLocalVariable = 1u; /* Do something */ MyLocalFunction(); } static void MyLocalFunction(void) { /* Do something */ MyExternVariable = 2u; } </pre> <p>Module1.h:</p> <pre> #ifndef __MODULE1.H #define __MODULE1.H extern unsigned int MyExternVariable; void MyExternFunction(void); #endif </pre> <p>Module2.c</p> <pre> #include "Module.1.h" static void MyLocalFunction(void); static void MyLocalFunction(void) { MyExternVariable = 1u; MyExternFunction(); } </pre>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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