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Definition of DL. 1  DL is short for down-low, which basically means to keep things under-wraps, to keep a secret or lay low. 2  I'll tell you this, but, you gotta promise to keep it on the DL. D.L. means down low. it means that something is not known to all. if you keep something on the D.L... 2  you don't share it with others. 3  I don't want my Dad to find out, so keep it on the D.L. 4  She like me but keep that on the DL.
DLL files cannot, however, be directly executed, hence the existence of tools like rundll.exe and rundll32.exe. DLL files are nothing more than a means for developers to use shared code and data, allowing to upgrade functionalities without the need to re-link or re-compile applications. In other words, DLL files contain code and data that is used by several different applications.