diff --git a/DepotDownloader/ContentDownloader.cs b/DepotDownloader/ContentDownloader.cs
index a24b1003..6053b032 100644
--- a/DepotDownloader/ContentDownloader.cs
+++ b/DepotDownloader/ContentDownloader.cs
@@ -349,7 +349,7 @@ namespace DepotDownloader
                     Password = loginKey == null ? password : null,
                     ShouldRememberPassword = Config.RememberPassword,
                     LoginKey = loginKey,
-                    LoginID = 0x534B32, // "SK2"
+                    LoginID = Config.LoginID ?? 0x534B32, // "SK2"
                 }
             );
 
diff --git a/DepotDownloader/DownloadConfig.cs b/DepotDownloader/DownloadConfig.cs
index fc695aa8..d337d540 100644
--- a/DepotDownloader/DownloadConfig.cs
+++ b/DepotDownloader/DownloadConfig.cs
@@ -25,5 +25,8 @@ namespace DepotDownloader
 
         public string SuppliedPassword { get; set; }
         public bool RememberPassword { get; set; }
+
+        // A Steam LoginID to allow multiple concurrent connections
+        public uint? LoginID {get; set; }
     }
 }
diff --git a/DepotDownloader/Program.cs b/DepotDownloader/Program.cs
index 5b6e5f65..3cb9f0bb 100644
--- a/DepotDownloader/Program.cs
+++ b/DepotDownloader/Program.cs
@@ -101,6 +101,7 @@ namespace DepotDownloader
             ContentDownloader.Config.MaxServers = GetParameter<int>( args, "-max-servers", 20 );
             ContentDownloader.Config.MaxDownloads = GetParameter<int>( args, "-max-downloads", 4 );
             ContentDownloader.Config.MaxServers = Math.Max( ContentDownloader.Config.MaxServers, ContentDownloader.Config.MaxDownloads );
+            ContentDownloader.Config.LoginID = HasParameter( args, "-loginid" ) ? (uint?)GetParameter<uint>( args, "-loginid" ) : null;
 
             #endregion
 
@@ -303,6 +304,7 @@ namespace DepotDownloader
             Console.WriteLine( "\t-cellid <#>\t\t\t\t- the overridden CellID of the content server to download from." );
             Console.WriteLine( "\t-max-servers <#>\t\t- maximum number of content servers to use. (default: 8)." );
             Console.WriteLine( "\t-max-downloads <#>\t\t- maximum number of chunks to download concurrently. (default: 4)." );
+            Console.WriteLine( "\t-loginid <#>\t\t- a unique 32-bit integer Steam LogonID in decimal, required if running multiple instances of DepotDownloader concurrently." );
         }
     }
 }