How to call lisp to another lisp

Dear all

How to call lisp to another lisp

I want startup lisp abc.lsp execute my main lisp xyz.lsp

& another question startup lisp abc.lsp execute my xyz.lsp internal command : aaa

[color=red]Subfunction:[/color]

(MySubfunction)

[color=red]Subfunction with Arguments:[/color]

(MySubfunction arg1 arg2 arg3 ... argN)

[color=red]Main function:[/color]

(c:MyFunction)

[color=red]Subfunction:[/color]

(MySubfunction)

[color=red]Subfunction with Arguments:[/color]

(MySubfunction arg1 arg2 arg3 ... argN)

[color=red]Main function:[/color]

(c:MyFunction)

Dear sir

Thx for reply

it's possible give example

(defun c:main ( )
 (print (DoMath 3.4)) ;; Call subfunction with arguments
 (c:main2) ;; Call main function
 (princ)
)

(defun DoMath ( x ) (sqrt (+ x 4.0)))

(defun c:main2 ( )
 (alert "Main2 Executed")
 (princ)
)

1>xyz.lsp>

(defun aaa

(princ)

)

(defun main

(princ)

)

(main)

(defun c:aaa2

(aaa)

)

2>abc.lsp>

(load xyz.lsp)

(aaa2)

dear sir

thx for reply