diff --git a/src_main/io_devices/piiodevice.cpp b/src_main/io_devices/piiodevice.cpp
index 646f40e4..307cae2f 100755
--- a/src_main/io_devices/piiodevice.cpp
+++ b/src_main/io_devices/piiodevice.cpp
@@ -379,6 +379,16 @@ void PIIODevice::splitFullPath(PIString fpwm, PIString * full_path, DeviceMode *
 }
 
 
+PIStringList PIIODevice::availablePrefixes() {
+	PIStringList ret;
+	PIVector<const PIObject * > rd(PICollection::groupElements("__PIIODevices__"));
+	piForeachC (PIObject * d, rd) {
+		ret << ((const PIIODevice * )d)->fullPathPrefix();
+	}
+	return ret;
+}
+
+
 PIString PIIODevice::fullPathOptions() const {
 	if (mode_ == ReadWrite && options_ == 0) return PIString();
 	PIString ret(" (");
diff --git a/src_main/io_devices/piiodevice.h b/src_main/io_devices/piiodevice.h
index b152feb5..45129ee1 100755
--- a/src_main/io_devices/piiodevice.h
+++ b/src_main/io_devices/piiodevice.h
@@ -256,6 +256,9 @@ public:
 
 	static void splitFullPath(PIString fpwm, PIString * full_path, DeviceMode * mode = 0, DeviceOptions * opts = 0);
 
+	//! Returns fullPath prefixes of all registered devices
+	static PIStringList availablePrefixes();
+
 	
 	EVENT_HANDLER(bool, open) {if (!init_) init(); opened_ = openDevice(); if (opened_) opened(); return opened_;}
 	EVENT_HANDLER1(bool, open, const PIString &, _path) {setPath(_path); if (!init_) init(); opened_ = openDevice(); if (opened_) opened(); return opened_;}