diff --git a/core/defs/clients.def.php b/core/defs/clients.def.php
new file mode 100644
index 00000000..5503a87f
--- /dev/null
+++ b/core/defs/clients.def.php
@@ -0,0 +1,32 @@
+<?php
+/**
+ * Ultima PHP - OpenSource Ultima Online Server written in PHP
+ * Version: 0.1 - Pre Alpha
+ */
+
+abstract class clientDefs {
+    const CLIENT_NONE                 = 0x00000000;
+    const CLIENT_T2A                  = 0x00000001;
+    const CLIENT_UOR                  = 0x00000002;
+    const CLIENT_UOTD                 = 0x00000004;
+    const CLIENT_LBR                  = 0x00000008;
+    const CLIENT_AOS                  = 0x00000010;
+    const CLIENT_SIXTHCHARACTERSLOT   = 0x00000020;
+    const CLIENT_SE                   = 0x00000040;
+    const CLIENT_ML                   = 0x00000080;
+    const CLIENT_EIGTHAGE             = 0x00000100;
+    const CLIENT_NINTHAGE             = 0x00000200; /* CRYSTAL/SHADOW CUSTOM HOUSE TILES */
+    const CLIENT_TENTHAGE             = 0x00000400;
+    const CLIENT_INCREASEDSTORAGE     = 0x00000800; /* INCREASED HOUSING/BANK STORAGE */
+    const CLIENT_SEVENTHCHARACTERSLOT = 0x00001000;
+    const CLIENT_ROLEPLAYFACES        = 0x00002000;
+    const CLIENT_TRIALACCOUNT         = 0x00004000;
+    const CLIENT_LIVEACCOUNT          = 0x00008000;
+    const CLIENT_SA                   = 0x00010000;
+    const CLIENT_HS                   = 0x00020000;
+    const CLIENT_GOTHIC               = 0x00040000;
+    const CLIENT_RUSTIC               = 0x00080000;
+    const CLIENT_JUNGLE               = 0x00100000;
+    const CLIENT_SHADOWGUARD          = 0x00200000;
+    const CLIENT_TOL                  = 0x00400000;
+}
\ No newline at end of file
diff --git a/core/defs/expansions.def.php b/core/defs/expansions.def.php
new file mode 100644
index 00000000..a1ca52b8
--- /dev/null
+++ b/core/defs/expansions.def.php
@@ -0,0 +1,19 @@
+<?php
+/**
+ * Ultima PHP - OpenSource Ultima Online Server written in PHP
+ * Version: 0.1 - Pre Alpha
+ */
+
+abstract class expansionDefs {
+    const EXPANSION_NONE               = clientDefs::CLIENT_NONE;
+    const EXPANSION_T2A                = clientDefs::CLIENT_T2A;
+    const EXPANSION_UOR                = self::EXPANSION_T2A  | clientDefs::CLIENT_UOR;
+    const EXPANSION_UOTD               = self::EXPANSION_UOR  | clientDefs::CLIENT_UOTD;
+    const EXPANSION_LBR                = self::EXPANSION_UOTD | clientDefs::CLIENT_LBR;
+    const EXPANSION_AOS                = self::EXPANSION_LBR  | clientDefs::CLIENT_AOS | clientDefs::CLIENT_LIVEACCOUNT;
+    const EXPANSION_SE                 = self::EXPANSION_AOS  | clientDefs::CLIENT_SE;
+    const EXPANSION_ML                 = self::EXPANSION_SE   | clientDefs::CLIENT_ML  | clientDefs::CLIENT_NINTHAGE;
+    const EXPANSION_SA                 = self::EXPANSION_ML   | clientDefs::CLIENT_SA  | clientDefs::CLIENT_GOTHIC | clientDefs::CLIENT_RUSTIC;
+    const EXPANSION_HS                 = self::EXPANSION_SA   | clientDefs::CLIENT_HS;
+    const EXPANSION_TOL                = self::EXPANSION_HS   | clientDefs::CLIENT_TOL | clientDefs::CLIENT_JUNGLE | clientDefs::CLIENT_SHADOWGUARD;
+}
\ No newline at end of file