diff --git a/ids.go b/ids.go
deleted file mode 100644
index 66dd587c..00000000
--- a/ids.go
+++ /dev/null
@@ -1,61 +0,0 @@
-// 23 february 2015
-
-package ui
-
-// Go pointers cannot be passed to C safely.
-// The Go runtime will move them around, tripping C up.
-// However, C pointers don't have this problem.
-// Solution: use the C pointer to get the Go object needed!
-
-import (
-	"fmt"
-	"sync"
-)
-
-var (
-	ids		map[uintptr]interface{}
-	idsLock	sync.Mutex
-)
-
-func getGoObject(cptr uintptr) interface{} {
-	idsLock.Lock()
-	defer idsLock.Unlock()
-
-	if i, ok := ids[cptr]; ok {
-		return i
-	}
-	panic(fmt.Errorf("[BUG in package ui; report to andlabs immediately] C pointer %p not associated with Go object in package ui", cptr))
-}
-
-func associateGoObject(cptr uintptr, goobj interface{}) {
-	idsLock.Lock()
-	defer idsLock.Unlock()
-
-	if i, ok := ids[cptr]; ok {
-		panic(fmt.Errorf("[BUG in package ui; report to andlabs immediately] C pointer %p already associated with Go object of type %T but we want to associate it with Go object of type %T", cptr, i, goobj))
-	}
-	ids[cptr] = goobj
-}
-
-func disassociateGoObject(cptr uintptr) {
-	idsLock.Lock()
-	defer idsLock.Unlock()
-
-	if _, ok := ids[cptr]; !ok {
-		panic(fmt.Errorf("[BUG in package ui; report to andlabs immediately] C pointer %p not associated with any Go object but we want to disassociate it", cptr))
-	}
-	delete(ids, cptr)
-}
-
-func idsHandler(req *request) bool {
-	switch req.id {
-	case reqObjectDestroyed:
-		disassociateGoObject(req.ptr)
-		return true
-	}
-	return false
-}
-
-func init() {
-	interopHandlers = append(interopHandlers, idsHandler)
-}