KBWAIT can be used to query a on-screen keyboard drawn by KBDRAW . If a key was touched, the function returns TRUE, if another screen area was touched, it returns FALSE. The character represented by the key is stored to KEYCHAR.
KEYCHAR can have some special values that represent non-character keys:

KEYCHAR	Taste
CHR&(0x0A)	NEXT
CHR&(0x0D)	RETURN
CHR&(0x7F)	DEL