EXCEL vba :请教这几句话是包含系统库文件的意思么

EXCEL vba :请问这几句话是包含系统库文件的意思么？
在别人的程序里看来的。
Declare   Sub   keybd_event   Lib   "user32 "   (ByVal   bVk   As   Integer,   ByVal   bScan   As   Integer,   ByVal   dwFlags   As   Long,   ByVal   dwExtraInfo   As   Long)
Declare   Sub   Sleep   Lib   "kernel32 "   (ByVal   dwMilliseconds   As   Long)
Declare   Function   MapVirtualKey   Lib   "user32 "   Alias   "MapVirtualKeyA "   (ByVal   wCode   As   Long,   ByVal   wMapType   As   Long)   As   Long

[解决办法]
keybd_event，MapVirtualKey，Sleep是三个API函数，
这三句是调用这几个API的声明