How to use a self created library in Keil C ?

How to use a self created library and the default *.lib in Keil C ?
and which and how to setup a default *.lib such as the following - c51s.lib ? c51L.lib ? c51c.lib ?

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i have create a header file myfirst.h
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#pragma SAVE
#pragma REGPARMS
extern char returndummychar(void);
#pragma RESTORE

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and the source code myfirst.c
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char returndummychar(void)
{
return('a');
}

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I compile the file and have myfirst.obj
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lib51 create myfirst.lib
lib51 add myfirst.obj to myfirst.lib

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All the above steps are done. now, how to include the myfirst.lib in a new C
project ??

Thank you very much !

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